1. Make up your mind and set goals.
2. Don't catch up on the lessons you left behind now, start with the basics, because mathematics is closely related.
3. Ask a classmate who is good at math for help, and ask a teacher for help. Or find a tutor.
You should study hard and practice hard, don't be intimidated by difficulties, and don't know how to ask others humbly. Over time, you will catch up with math.
I wish you progress!