This thread really helped me remember where to focus my efforts in my later years of high school, as I definitely did not balance FRC and schoolwork well enough.
2015 was my last game as a student, and I'm currently in first year university.
This post is mostly targeted to university bound students, but there's some useful information for anyone.
You will see your grades decrease during build season. Don't let them crash too hard, and work extra hard before and after season to compensate. I'm the kind of person who has to be at every meeting or I'll feel like I'm missing out and not contributing. If you're that kind of person too, PLEASE PLEASE PLEASE leave yourself sometime before, during, or after meetings to study. I had an hour commute each way by public transit to 1310, so I took advantage of that time. Don't be afraid to excuse yourself for an hour or two during meetings to go sit in an empty classroom.
Talk with your teachers, ask if they can give you some leniency on deadlines. I've found that once I explained my time commitment to robotics, my teachers were very understanding and let my hand in assignments late without penalty. Don't take advantage of this, but use it if you really have to. Do make sure you talk to them in advance, before anything is due. Don't show up to class the day a big project is due and say that you couldn't finish because you were at robotics. You will see your grades decrease during build season. Don't let them crash too hard, and work extra hard before and after season to compensate.
You do not have to go to meetings every day. I did and I probably shouldn't have. My team didn't meet on Sundays, I have no idea how people can attend meetings 7 days a week. If I had attended meetings on Sunday's too I can confidently say I wouldn't have gotten into the university I did.
FRC is not worth giving up your grades. If you're planning on attending university this message is especially important. FRC definitely provides you valuable skills over others, after one semester in engineering I've already noticed this, but you also have to get there. Don't trick yourself into "FRC is the best learning you'll ever do" mindset because it's not true. FRC is incredible and one of the most important aspects of my life, but your formal education is more important. Don't hurt yourself in the future.
You will see your grades decrease during build season. Don't let them crash too hard, and work extra hard before and after season to compensate.
This thread has good examples of things to try and avoid.