I don't get what is wrong I feel like I'm trying my best and it isn't good in of...help!?

Asalamu Alaykum :) I feel like I"m trying so hard in school and now I have an F IN geometry my parents love me and know I can do better I honestly don't even know I'm getting help from my teacher and stuff idk what is happening. i WANT TO CRY AND BURST IN TO TEARS. Please tell me dua's I can read anything I need help thank you and please ma'a salam.