How do i change my grade before report cards i n 8 days?

i need help!!! my parents are really concerned about my education etc and im always good at math just nt at math and im pretty sure im geting a bad report card and i study hard and my teacher hates me and i want to change my grades before i get my report card PLEASE HELP!How do i change my grade before report cards i n 8 days?
sorry, but there's absolutely nothing you can do in 8 days.

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