How do I get more energy?

The question can be reworded to: How do I not get sleepy?
I wake up at 6 A.M. to go to school (it is very hard to wake up). The next few months will be VERY busy for me – as I have tennis after school (3–5 hours everyday) and many standardized testing priorities. This is very worrisome to me because I always get sleepy during and after school. Heck, even if I do not do anything for the whole day, for some reason, I get sleepy. What are some tips or advice that can help me become more energized or less sleepy?