I didn't learn from any books, all I did was Crack DAT Math. All the problems you encounter in this you will encounter on the real thing. So long as you know how to practice with these problem sets and solve them quickly you should be set. My median scores ranged from 21-24 and I got a 22 on the real thing. Just be prepared to expect slightly harder problems on the real thing because AFAIK there is nothing on the market right now that matches the difficulty of the real QR.