Time is too short :(

For me the most difficult task right now is time management. I am a really a lazy person and hate to study but love to do sports. I may be the best basketball player in the world but without good grades I am sure all the skills go down the drain. My week is really hard and really short based on all the practices and games played. School teams practice twice a week and also play twice a week, most of the time the practice or games go from 3:30 on to 5 or 6. Outside of school my team practices three times a week from 7 to 9:30, meaning that I get home like at 10 really tired and without wanting to study at all. This is a really difficult situation because my body is  tired, wanting to sleep and still haven't even opened a book to do my homework. This problem is really affecting my school grades therefore I must do something about it and quick. My dad recommended me to play either at school or outside of school but you never know when a scout will watch your game so the more you play the more you have a chance to get a scholarship. My grades are also really important so therefore I made the decision to only practice once a week in school, this decision is giving me the chance to be able to study and get my grades up.