What can i do so that i can at least make a reasonable attempt at being an NBA player?My grades are good, Im only 14, 15 in a month or so. i shoot...

I'm afraid there's not a whole lot of call in the NBA for
5'7" people who are not very fast.  Of course, you are only 15 so there is still hope
for growth.

It sounds like you are not going to be really
tall, though, so your only hope would be as a guard.  That means that you are going to
have to be as quick as you possibly can be and you are going to have to extend the range
on your shot. Of course, the best way to do those things is to get stronger and to
practice incessantly.

For quickness, you might want to find
some cone drills and agility drills.  Those kinds of drills will improve your quickness
if you keep at them.  For shooting, of course, it's just shoot, shoot, shoot.  Set
yourself a goal for some large number of shots each day this summer.  Make sure you use
good form, especially as you get tired.

You may not make
the NBA, but improving your game will be a good thing no matter what, because it will be
satisfying to you to see yourself rewarded for hard work.