I definitely suggest getting Math Destroyer.
I found the QR section in back of DAT destroyer to be alot easier than actual questions, and the questions in Math Destroyer.
I went thru the Math D once carefully and did learn few tricks that helped on my exam.
Make sure you do the book TWICE, first time learn the material, and second time yourself and increase your speed.
I wished I had time to do second step.
But if you master Math Destroyer you are guaranteed 24+ 🙂
GOOD LUCK and STudy HARD [HARDER than I did. 😛]