AP Chem all the way. You'll be thanking yourself for getting good grades in it when you get to be as old as me
Your team should understand, especially your faculty members. Force yourself to think about design only a half hour before the meeting and then stay the whole meeting or sit down and think about it for an hour, tell your ideas to a mentor, and skip the meeting.
And, it's all about the tricks of the trade: I used to study during build season by promising that if I study for a solid hour, I could give myself 15 min to check CD, grab a drink, etc. Sometimes I followed it, sometimes I didn't....but I was always happier the times that I did stick to it.
Or groupstudy! When I was in HS class would let out at 2:05 and the meetings didn't start until 4....so the students would help eachother study or do homework until the meeting began.
Hope this helps