yowch! hope the book is interesting at least!
I don't know what B and A groups correspond to Cat-wise, but I started riding casually for a couple of months last year, took a break over the winter, and started up again with serious training in March. I can ride comfortably in the Cat5 peloton and when I'm in a masochistic mood can sometimes hang on for dear life with the A group in practice road races (not college A's, a local racing club/team, CBRC). My mind hasn't caught up with my legs, so to be really ready to race will probably take another season of learning the ins and outs.