You'll find a time. You just shouldn't get angry if you receive a low grade without studying and thinking it's just as good as someone's A.
You can pace yourself with studying and as time goes by add on to that time. I study for 30 minutes or if I don't know anything I'll go after school for review for the only way for me to learn is to view it. I'm not so good with reading since I get distracted, become really bored, or just loose focus and I'm looking at the book(sometime it feels like I'm going cross-eyed).