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I had taken Calculus before in high school, so I thought I would be prepared for this class and it would not be too challenging. Renfrew was a lot harder than I expected. He gave a lot of examples, which helped. But the examples we learned in lecture were a lot easier than the homework and exams. Make sure you spend time doing problems every day and go in for help.
Professor Renfrew is an extremely intelligent guy, but maybe not the best at teaching people who are new to calculus. If you are comfortable with calculus going into the class, you will be fine. If you struggle with calculus or haven't taken the equivalent high school course (situation I was in), this class can be tough.
Homework consists of three questions a week (that he makes himself). These can be very tricky but are surprisingly useful in that they force you to think critically about the concepts discussed in class.
Renfrew is a super nice guy and office hours are helpful, he is very available and willing to help.
Test questions can be weird, but as long as you know the concepts and can demonstrate them, you are guaranteed partial credit.
B+ in the class. He curved one midterm and didn't curve the class. Overall, not a bad experience, not a great experience. Take him if you know calculus.
I have to say the comment above is somewhat inappropriate.
For lectures, prof. Renfrew often confused himself and occasionally he ignored those who pointed out his mistakes. (But I have to say as long as one shouts out loudly about his mistake(s), he will definitely correct it/them)
For office hours and availability, I never went to his office hours so I have no idea about how it is, but I heard he is available and patient. I only asked some questions after class, and he was very willing to patiently explain them to me.
For tests and homework, prof. Renfrew's tests and homework have never been difficult, but the calculation can be annoying sometimes. There are only three very easy collected problems every week, but I highly recommend everyone to complete those uncollected problems as well. Those problems, although also really easy, can be very useful for tests since, for math, practice is perfect.
It is not hard to get an A in his class, and he gave out A pluses.
If you are good in high school Calculus, you can never go to his lectures and easily get an A or A+. If not, I recommend you to choose other professors who can explain materials better.
I took Renfrew for 31A in fall quarter. His lectures seemed bring (because I already had taken 31A material in high school.) His homework was usually tough (only 3 problems weekly though). On Mondays and Wednesdays, he was a smart teacher, but on Fridays used to be a bit dumber. (Thirsty thursdays, maybe?)
He is not a bad professor by any means, his class isn't that hard either. It's way better than most professors (except Brown, I think.).
If you don't know 31A stuff already, make sure you attend all his lectures and go for discussions. (I hardly attended any lectures, yet am headed for an A+)
But I know people who attended his lectures regularly, had taken 31A in high school, yet found it hard to get an A in this class.
All in all, I'd suggest, you take this class.
You will not regret it.