lsat prep tests

Which book of tests should I purchase?

I dont need the explanations, just the tests.

http://www.amazon.com/New-Actual-Official-LSAT-PrepTests/dp/0984636005/ref=pd_sim_b_3
http://www.amazon.com/Next-Actual-Official-LSAT-PrepTests/dp/0979305055/ref=pd_sim_b_1