Recommended AP calculus assistance material?

[dnt]

sorry if this doesn't belong here - please feel free to move it to the proper section.

im looking for a good book/reference material that would be helpful during a year of HS AP calculus. something that will supplement the school material and help me better understand it as we go through it.

any recommendations?

 

[EbolaPox]

An AP Review book by Barron's or Princeton Review would be useful. The Barron's is "harder" than the test, and has good practice problems.