Any tips for the SAT and ACT?

I would really like to achieve at least a 2100 on the SAT and I would like at least 32 out of 36 on the ACT. I took the PSAT in the beginning of the year and recieved 155 (which is the equivalent of 1550 on the SAT). However, I had learned none of the math material that was on the test. What are some tips for taking the SAT and ACT and what can I do to study? Thanks in advance.