Hey!
ERICA MELTZER ERICA MELTZER ERICA MELTZER!!! Her books are by far the best for the reading and writing portions on the SAT.
Also, pick a semi-difficult novel to read for the reading section. I read the Scarlet Letter and it helped tremendously with my reading score.
For math, I did not really prep because I did AMC/AIMES. However, I think that Barrons is the way to go.
Lastly, go to Cracksat. They have TONS of practice!
Good luck! I remember all of the stress that I carried last year and everything still turned out fine!