<p>I’ve actually taken Math 10A/10B when it was offered the first time as Math 91 in Fall 2011/Spring 2012. Material-wise, the stuff is MUCH MUCH harder. You will be taught stuff from Math 172, Statistics 135, Statistics 134, and Math 55. The grading/curve however is more lenient, especially if you take it with Pachter (who also taught me when I took it). The issue is, you’ve probably learnt almost everything out of the 1A-1B sequence so it’s more “comfortable,” whereas for 10A-10B, it’s unlikely you’ve seen more than half of it. If you have any questions about it, feel free to ask. I loved the class when I took it!</p>