try harder, ask a teacher for help, ask if u can do some extra work to get your grades up, or have a study partner it's much easier.
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Keep trying.
Revise after uni/ college, do extra work, go to an after school club. Or you could talk to your teachers and get them to give you extra tutoring.
If your grades are low, you should study harder and look for tutorial lessons in areas whereby that you are weak.