Should I time my SAT practice test?

So I just got my PSAT scores. To me, they're quite good - Critical Reading - 59, Math - 54, Writing - 60. However, I want to score above 700 on each section on the actual test. The writing section is something that I excel in. The critical is okay.. and the math section is just a nightmare. What books should I get in order to get better at the math and critical reading section? When I take practice tests, do I time them? (Whenever something is timed, I get very antsy and will miss questions that I know the answers to) I'm planning to Emory, My GPA is 4.0+. What kind of SAT scores are they looking for and do they require you to take the ACT? PS I really need some online SAT resources such as practice tests and etc. Could anyone tell me some? I'm sorry. I hope I'm not asking for too much. I just really want to do well on this test.