How do I go from a 500 to a 600+ in math?

<p>I am currently a high school senior, who is retaking the SAT in order to be more competitive in ivy transfer admissions. My critical reading and writing were in the 700s but my math was low. Anyway, I am planning on retaking the SAT on June 7th which gives me 84 days to study. I have resigned up for the collegeboard online course and still have my PR book from the class. Are there any books I should buy in particular?</p>

<p>Use the grubers book for math, it really helps.</p>

<p>Thank You!!</p>