How to make time to study??

I’m a high school junior and I haven’t taken my SAT II tests yet (I have to take 2 of them) and I have to take the ACT this year as well. I feel so swamped with homework from AP classes, trying to get my license, and planning for college that I have no idea how to fit in time to actually study for these tests. I really want to do well on these exams. Please help!