Should I get Dr. Chung's, Pwn, or Gruber for Math?

I am scoring about 600 on math. What should I get one?

Also, is blue book easier than recent tests?

Gruber

Pwn and Dr.Chung’s.

After you go through Pwn, go through Dr. Chung’s. Dr. Chung’s book has level 4 and level 5 problems that may come up on #19 and #20 questions on the Math section. Helped me out very much.

Of those 3 choices, PWN is clearly the best for the old SAT (last chance is Jan 23).