I'm in lots of AP classes at school and I'm super busy so studying takes up a lot of my time. What I do like if I'm studying for a European history test is I'll pick an hour to start, let's stay 6:00 PM. So I read through my entire study guide once at 6:00. Maybe get done like 6:40ish. Then I say when it's 7:00 I'll read through it again. So I watch tv until 7 and then start it again. This time takes less, maybe 30 minutes. So then I have the free time until 8:00 and then I'll read it through again. This time takes maybe 15 minutes cause I've got the info down. Then next morning look over it and I'm fine. I like this because I'm basically watching tv while studying so I get breaks, repetition, and it feels like I'm just laying around watching tv, not studying. Works for me at least. You could try your own version of it. I'm a big fan of finding ways to study without feeling like studying.