Not sure how to really handle it. My daughter is facing the same issue at middle school. She gets put into group projects where no one does anything or plays "dumb" making her do the rest. She knows she's being used and feels trapped by the teacher and the kids if says no. They are all sliding by thanks to her. She doesn't have a problem teaching someone if they really need the help. It's the "dumb" people that bring her down and pass the class by using the smart people that work hard.