Changing grades? i need to convince a teacher to help me...?

my boyfriend has just been told that his gpa doesn't meet the requirements to stay in the track and field team, and the season is close to and end, we are seniors, and he is one of the best runners on the team, but with the grades that he got, he can't stay on the team. Our coach told him that he should talk to the teachers to try to work out a deal, but the teachers that he has are those kind of teachers that the grade they give out is final. The grades are our midterm grades, you can say, and they are not final, but since its half way, the school takes it seriously and without the gpa requirements, he can't participate in any extra curricular activities. I want to try to convince his teachers to boost up his grades just for this report card, but I don't know what to tell them. I mostly want to talk to his Calculus teacher, because my boyfriend is taking AP Calculus AB, and I am taking AP Calculus BC, so I'm thinking of telling his teacher that I will tutor him as much as possible, but I don't know what to do for his AP Physics C cl... I need ideas on how to convince them, whether it may be extra credit, or a deal of tutoring or something. Help me please! Today we have a track meet, and I don't know if my boyfriend will be able to compete, and I want him to be able to stay in the team, because I know that he has what it takes to make it to City Prelims. Help me please, I want to talk to them as soon as possible. Thank you!