To better understand how you perform on the SAT and ACT, take both exams to determine which format makes you more comfortable and then retake the test. 

Consider joining an ACT/SAT study group at school or forming one with friends. 

You can take two SATs, two ACTs, and four SAT Subject tests for free if you have free or reduced lunch or you are part of a college access program like TRIO/AVID. Additionally, the fee waiver covers the optional essay section of the ACT/SAT if you want to or need to take it. 

List the colleges to which you wish to have your test scores forwarded when you register for the test. 

Make sure your admission ticket matches your picture ID and print it. 

You might be able to find practice books and test prep at your school or local library.

You should check if SAT Subject Tests and writing portions of the SAT/ACT are required or strongly recommended for admissions into schools like Ivy Leagues.