What can you do on a marks appeal date?

it's tomorrow starting from 9-12 where you can go to the school to appeal a final mark you got during the last semester. I have all A's except for english which i have a C-. I wanna have a C+ so i don't get put in the dumb class for next year. Im 5% from being able to do so... what happens at this date? do you get extra credit?