Well, now that his AP tests are over with, I think he’ll try some of them. His reasoning was based on talking to his pre-Calc and BC teachers, both Cal math grads, who suggested this. In fact his pre-Calc teacher went so far as to suggest that it wouldn’t hurt to start back with Math 1A. I personally am in favor of just moving ahead except that I’ve heard that there’s a lot of stuff in Math 54 that needs Math 1B and I just don’t know how much of it he remembers. Especially the latter part of BC such as proving infinite summations.