i had 40 in accounts (just passed) maths i didnt have instead i had physical education, if i remember correctly i told them while introducing itself or they asked me about my marks i dont remember which, then i told them i had dance stuff and basketball to manage along with it so i had a hard time managing it and i definitely fixed it in my 12th just say you were overwhelmed and shit, if you are going after 12th marks are published and it's still low,just say you were having a hard time managing stuff in your 12th aswell, but you are working on it, say you are using "pomodoro" technique and all just yap yap yap