<p>The differences in the exams are given here. It is hard to judge how difficult it will be for you since it depends a lot on your mathematic abilities (which I don't know). Self-studying for the BC exam is definately worth it though IMO. Our teacher taught Calc AB and BC by lessons. There were 50 lessons for AB and 65 lessons for BC, 15 new lessons is a small price to pay compare to taking an entire extra semester of calc in college. </p>
<p>Talk to your teacher about possible tutoring of the BC topics. I also suggest using some textbook to teach you the BC topics, review guides don't go into enough detail about the general theory because like the above poster said, series can be extremely difficult the first time you deal with them. The Barrons review book is probably your best bet, much more difficult than the actual AP exam so if you can get through it you will be sufficiently prepared.</p>