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I'm going to have my brother tutor me for AP Physics B (he got a 5 on the test a while ago and my school doesn't offer AP sciences =( ), but I'd like to have a prep book so I'll have some practice tests to play with.

So- any suggestions about which prep book I should buy? I'm looking for the most accurate one. Overprep made me depressed on APUSH when I kept tanking on Barron's practice tests so I don't want to repeat that experince.

Thanks in advance =)