Seems like he's confused most of the time, unorganized and doesn't seem to care about perf. of his students. Half the stuff I did wrong on tests was because I listened in class- if you take this only learn from the book!!!

worst professor I have ever had in my life. Do not take if your graduation depended on it!!!!

He could not explain anything. The only way to pass his tests was to know the old ones inside and out. Once,someone in our class asked him a question, and he just said "what....?" after a long pause, she just said "nevermind, I'll fi

I dropped this class after about a month. Overall the problems you do he only has about 20 questions on the test. So if you get one wrong it affects your grade so much. wouldnt suggest taking math at ou try occ. i should have listened.

You cannot understand stand him unless the entire class is very quiet, and he just sucks.

Never went to class, still passed with flying colors. The classes I did go to only confused me, I got my worst test score on a portion of the test that he did explain while I was in class. Do not take this professor unless you can figure things out alone

Do not, I repeat, Do not take this man for this class. He's never available when you need help nor can you understand him when talks. Not to mention that all he goes over is proofs from the book. Take my advice and don't take him for anything.

AWFULL!!!!!!!!!! The worst professor I ever had. Isn't helpful, your grade is just your tests. Teaches right from the book. Don't reccommended

Too thick an accent, didn't answer any questions, made typos without correcting them, and I'm still asking myself why he hasn't been struck down by lightning.

Be prepared for death........Cahlon will cook you on his exams.

::frustrated scream:: His lectures: 100% word for word from the textbook. His tests: Out of left field and wraught with errors. His grading: random and merciless. I feel like I have no control over my grade in that class.

tests are ridiculously hard, then he'll say "i thought it was easy" in class. ??? if you want to pass this class, do not take him, he will flunk you ~i'm not kidding

Final is 50% of class, oh....and NO ONE passed the 1st two tests which were worth a 1/4 a peice. Thats it..thats your grade....a nice 1.6 or maybe a 1.7. great, i'm very frustrated with this teacher. studying the material seems to NOT help much for his tests. Where he gets his test questions is beyond me? :(

Advice to future Oakland Grizzles. Do not take Math courses at OU. please!!!!! I was a A student in highschool, and I failed math! The exams are very difficult. The grade is based on your exams, thats it. nothing else. no assignment, no extra credit...This guy cant speak english well. Oakland math department is the worst in the world! Screw OU.

What a great class and prof. I will so much enjoy taking it all over again. Maybe you like taking classes twice, if you do, take Cahlon, he's great at sucking the energy out of you during lecture. YAE! I love OU's Math. Their MOTO: Try it once, try it again and pay twice, we dont care, we only hire the worst math teachers

destroyed my confidence and my interest in math spent tons of time studing to get a 2.5. just dont take him

What are you talking about? hhhmmm? Cahlon NEVER adds points to any tests. I had him for Calc 1 and 3, you lie! For what reason, I am unsure of. He's a bad teacher, never gives examples and gives little partial credit. Your in calc 1, take it easy tough guy, it only gets harder

AWFUL!!!! As most of OU's Math Professors are. The lecture is absolutely pointless, you have to teach yourself. AVOID!! AVOID!!

does not care about the students or the class, reads right out of the textbook with no other explanation, grading is not made clear, tests are impossible, not available outside of class, doesn't even return emails, AVOID AT ALL COSTS

The worst prof ever!!!

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He is very hard to understand, his hand writting is horrible. everything is right out of the book. Also very boring......

Very hard to understand. Russian, i think. Reads directly from the book, so there is no use buying one. Gives homework, but doesn't check. Long, drawn-out examples. Bad handwriting. Never understands his students questions, and struggles on adding simple things!

Very hard to understand. Russian, i think. Reads directly from the book, so there is no use buying one. Gives homework, but doesn't check. Long, drawn-out examples. Bad handwriting. Never understands his students questions, and struggles on adding simple things!

Very hard to understand. Doesnt teach well at all. Tests and homework are very difficult because you basically have to teach yourself everything. Offers little help to his students, tho he claims to "want to see everyone do well". Not doing a very good job of accomplishing that buddy.

First off, he is really hard to understand and he repeats the same thing over at least three times. Secondly, I pointed out a mistake in the book and he said "who cares what it says"

Can't understand, notes are difficult, only reason I passed was from my supplemental class that he didn't even tell us about until after the first exam. He asks questions on things you won't be tested on but he still grades your homework for correctness. Avoid at all costs, worthless prof.

Worst professor I have ever had, useless due to his reading from the book and notes are a different wording of the book. He would not provide a review sheet at all, or spend review sessions going over questions. The only good is that he does not change any question from his exams to the final. He does not even make his own exams.

Don't take this class! I passed with a B and was at my wits end. Perfect attendance is basically mandatory. You will want to duck out of every class. Learning from the book is the only way to pass. The teacher is crazy.

Doesn't communicate well at all. Can't understand what he's saying and he doesn't answer questions.

NEVER take this professor. Ever.

I would highly recommend not taking this professor! I studied 3 times as much as all my other classes combined and still have not passed this class,exams are very difficult and you will basically have to teach yourself Calculus. Not very helpful at all, reads from the book and hard to follow his lectures. I learned more from the tutoring center..

This professor is absolutely the worst professor i had. I have never failed a class before and this is the first time! He is hard to understand and he has no idea how to teach. Dont get me wrong he knows his stuff but he can not explain jack to students who have never taken this class before. His exams are ridiculously hard. Do not take! Im serious

Cannot explain simple topics. Copies everything off from the book. I had to study everything on my own, but because attendance was mandatory I had to waste time sitting there not understanding nothing. Avoid this teacher if possible!

Never write reviews but he was one of the worst professors I've had. Teaches word for word from the book while facing the board. Very hard to understand and confusing when trying to explain himself. Avoid this professor at all costs.

Although he knows his math, he is hard to understand, always makes mistakes during his lectures, and his tests are NOTHING like the 3 hours of homework you receive. You must remember all of the formulas and you're not allowed to use a calculator or notes (OU math polices) on the test. Attend the SI and dedicate your time to calc 2 if you take him!

I have never studied for a class as much as I studied for his calc two class. I got a 3.9 and a certificate of merit for how well I did in calc 1. This class barely I made it out with a 0.0. I tried everything but couldn't make SI. Made me rethink my major though. I guess something good came from it.

Not clear about grading criteria. Doesn't offer sample tests. Not willing to help students. Not clear about what the material will be. By far the worst math professor at OU. Lectures are hard to follow and full of information that is not helpful. Curveballs you on the test by testing on material he never taught.

Just don't take him.. please.

He definitely knows the subject but has a very hard time communicating the information to the students. If a question was asked in lecture it would almost never be answered. The tests were way more difficult than anything in the workshops and they were worth more than half your grade. So if you didn't test well you didn't do well overall.

Explains things poorly and in a confusing way. Often makes mistakes when teaching which is obvious as his lectures are straight from the book. On top of that, he often ignored questions from students.

Doesn't look up from his paper the entire lecture. Has no clue how to answer students' questions because he never does it. No idea how he made it through school writing and talking the way he does but somehow he became a professor at an American University. Don't take this guy, but I guess at OU you don't have much of a choice.

Just rambles on, making the questions/ problems harder than what they actually have to be. At the moment I am begging God just for a C just to pass the class.

If I could have put 0's for the ratings I would. The is one of the worst teachers I've ever had. I feel bad for saying this because he truly cares for his students and loves teaching but he is awful. Heavy accent. Does problems too quick. No explanation.

Ignores students. Is unclear in lecture. Reads from pre-printed lectures, doesn't explain why it what is going on. I.e. "this is x thing. We see here x thing is done with y number yes? Y number is reaaaaly easy. Y number in x thing super easy that's it!" Then hands go up, he says one more minute, then ignores students for the rest of lecture.

Very hard to understand in class. He will start ranting and get something wrong and continue with the wrong things.

The worst professor I've ever had. He keeps his back to the class the entire lecture, the lecture is dry and difficult to understand, and it is almost entirely proofs. It is impossible to anticipate what is going to be on the tests and his grading is harsh and unclear. The only positive about him is that he's a nice guy, just a bad lecturer. Avoid.

Reads right from the book. Grade is only based on exams. Exam questions all require proofs, almost verbatim from the book . When I went to office hours to dispute a typo that changed the problems meaning his exact words were, "In math English doesn't matter". Well sure, it doesn't matter if you don't include word problems on exams. Which he did.

Cahlon is an extremely bad professor. This is the first time I've seen someone turn their back the whole time and not understand how to run class or answer questions. Bottom line don't take him. It also doesn't help that linear algebra is abstract as it is and he doesn't at least let us use our books on exams when he doesn't explain anything well.

Be Me About to take final exam Not totally confident, but hopefully Exam gets passed out I open the exam to find questions asking for complete proofs of theories But wait there is more 40 percent of the exam is 'finish the definition problems' I fill out every proof, definition, and problem I ended up with 31 percent DO NOT TAKE.

Just don't take him, avoid his class at all costs

The worst math teacher I have ever had. Went from 100% in Calc 1 to 70% with this man. He doesn't take the time to explain things, basically plagiarizes the book's proofs for "lectures", and when he lectures he talks to the board.

Professor Calhon is a nice a professor, but he is a horrible at teaching the material, his lectures don't help you the subject, really lengthy hw that doesn't encourage students to learn the material, and his writing is horrible. His exams are very hard and he grades harshly. I don't recommend taking him.

Never take this professor! He does not explain anything and he grades to fail you!

I had enrolled in his class and attended all SI sessions and was completely lost. I had to learn the majority of the material on my own; although I did receive some help from the SI. Everyone was confused. He is a generally kind professor but an awful teacher. Plenty of other great professors to take a pre-calc with.

Tough guy to follow in lectures. His handwriting is bad and he has a tough accent to follow. I took him for Calc 2 and had already taken AP Calc BC in high school. I was learning the same material but didnt understand what was going on. Highly recommend finding a different professor.

awful professor, just talks and doesnt explain anything and expects you to understand. you have to go home and teach yourself everything, his handwriting is atrocious and he gets the problems wrong, he copies everything out of the book.

Easily the worst professor I have ever had in my life. I did well but I had to work harder than ever and I had to teach myself the material. His lectures don't make any sense and his notes are sloppy. Going to class does not help your learning at all but attendance is part of your grade so even if it is a complete waste of time you still have to go

All around terrible professor, never in a million years would I recommend him to anyone. Heavy accent and terrible handwriting. Never does practice problems and only gives definitions. Good luck emailing him, he never responds to emails, the only way to get ahold of him is in class.

First of all his lecture notes are just scans of stuff he wrote on a notebook with horrible handwriting and unhelpful explanations of the class material. Your grade relies heavily on exams. If you take him prepare to teach yourself the class and don't even bother asking if you're stuck , he'll just dodge your questions.

It was impossible to reach this professor outside of class, 14 emails not replied to. Grades were based on 2 midterms and 1 final, the final being worth 50% Thick accent, awful handwriting. Avoid taking this professor.

I will update this later bc this is a premature rating early in the class but most of the other reviews are spot on. Cahlon is an older man and he is very nice and sweet. But from a teaching standpoint, it's bad. Confusing lectures, bad handwriting, strong accent. He doesn't teach anything, rather goes over premade notes. I have to learn myself atm

Worst professor i ever had. Heavy accent cant understand him. Sloppy writing. Doesn't respond to emails or anything. I do not recommend this horrible professor

Worst professor I've ever had. The lectures are so dry & boring; he waters down the pre-chapter notes & just talks over them, doesn't teach anything. On my test mistakes all his feedback was "NO!"/"Not Clear!" or "X" & took tons of points off w/o 1 expl./correction for help. No clear grading criteria. Tons of HW. Avoid like the plague, TRUST me...

Seems like a nice guy but his teaching style was confusing. Lectures were hard to understand and when youd ask a question he wouldnt really answer it. Almost always lectures will run longer and he grades tests hard. Your grade is based on your exams and review days were terrible.

How bad can it really be?. Trust me; BAD! Despite being kind, this professor is awful. Loads of HW and only some of the types of problems done are on the exams. The final exam was miles different than the review. Boring lectures that only go over proofs. Unclear grading criteria. No practice problems. Never gives clear answer to Qs. Must avoid.

Cahlon is the reason why i have to drop and retake this class. Heavy accent, horrible horrible handwriting, doesnt reply to emails, cant teach, reads everything off the book. Seriously, i look at his notes and am LOST. I feel bad considering hes very caring and respectful. Youre better off watching organic chemistry tutor on youtube.

Hes the worst Professor Ive ever had. 80% of the time you cant understand what hes saying because of his super thick accent. The entire class time he goes over notes which look like they were written by a 3rd grader and are so hard to understand. Whenever students ask him questions he never answers correctly. I doubt anyone has ever gotten an A