I completed Mod 2 at BGS in 2003. Lots of facts to learn etc., less calculation than Mod 1. If they still do the subjects in the same order, then you need to concentrate on Principles of Flight, Performance and AGK. I had learnt nothing on Air Law and Radio Nav prior to the brush-up course and found that the feedback and practice papers were spot on for the exam.
Best thing do to is give Alex a ring - he'll give you the best advice and save you a lot of leg work. It's a very good school, as I'm sure you've found out already so you shouldn't have any problems.
P.