Best Book to Improve SAT Math Score?

I’m taking the SAT in December and am looking for books to improve my math score, mostly because my PSAT score was terrible (projected score is like a 450-500 I think).
I heard that the 28 Math Lessons book is really good, but I also know there are multiple in the series and I don’t want to blow a lot of money. What books are the best?

The New Math SAT Game Plan: The Strategic Way to Score Higher Paperback by Philip Keller, if you are scoring below 650 and PWN the SAT: Math Guide Paperback by Mike McClenathan for over 650. Follow Stellarscores and debbie stier on twitter. Good luck!

Gruber books have been the best on the old SAT. Not sure how much the new has changed – seems like math is math…

I agree with @TNE2011. Dr. Steve has some good books too.

The 28 math lessons books is fantastic my 11th grade math psat was like a 58 and on my first real sat I scored a 740 now its important to note that having completed another half of a year of higher level math could have contributed to helping my score but I would recommend picking up the intermediate level book.

^I think he’s talking about books by Dr. Steve Warner