How do I study more efficiently?

I am an average sophomore in high school with grades just enough to keep me in the top 15 in my grade with about 100 people. I wanna do better but I have trouble studying. My school teachers are not that good at teaching. Besides that, I sing and act so I don't really have a lot of free time on my hands. My... show more I am an average sophomore in high school with grades just enough to keep me in the top 15 in my grade with about 100 people. I wanna do better but I have trouble studying. My school teachers are not that good at teaching. Besides that, I sing and act so I don't really have a lot of free time on my hands. My weakest subject is Biology. How do I improve and balance my time. I get really tired after school and I resort to 1 hour naps before singing rehearsals. I really wanna do better because high school is almost over. Thanks!
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