Make sure you get copies of the JMBS Student and Teacher Manuals as well as the Acorn book for APCS from apcentral.collegeboard.com.

Also, get your hands on Fran Trees review book for the AP that follows Computing Concepts with Java Essentials (CCJ) by Cay Horstmann from Wiley.

Last, but not least get the Barrons APCS Review book by Roslyn Teukolsky. These are all great references you should read thru very carefully. Then you should try all the practice exercises in these books!

Maybe you should also try the online labbook from www.horstmann.com for CCJ.

My students do well with these materials!

Good Luck,