I study profusely but I still get B's on tests. Please help?

Just relax. There are going to be times where you do extraordinarily well, other times where you do just as good or bad as everyone else, and other times where you will fail miserably. It is a part of life. I had as many 90's in high school as I did 55's. Try to enjoy high school because you will look back and realize it is going to a wonderful time in life you wish never ended.