Hello Mary!
I think you must talk to your parents. Tell them about your problems. They are your close people and always help you. I am doing at school well. I don't get a lot of top marks but I try. You can also ask your teachers to help - maybe to explain something you don't undestand. Do you have a lot of free time? What do you do at your free time? Do you like reading or listening to music? Do you like doing any sports?
I have to go. Write me soon.
Buy!