Re: Some unfortunate things as a Teenager... READ!
When I was a teen, my father wouldn't let me practice when he was home, my older brothers had given him all the rock n roll he could take. So I practiced after school.
Point being, don't let him hear you practice. Let him see you doing homework consistently, let him see you being ahead on jobs around the house, let him see a neat room. Most parents will completely loosen up if the important stuff is taken care of. If the grades are weak, meaning not mostly As, and the garbage isn't out without being told and your room looks like someone tossed a grenade in there, then he, as a responsible parent, has to do something. That means taking away your toys.
You take care of business, and you'll get what you want now and in the future.