If u get a good grade nd a bad grade will it bump up?

Ok I'm trying to follow my friends footsteps into OH university she has straight A s so in 7th in 1 month so I'm planning to get A s in everything but in math will the A s bump up the math grade I hate math it's too hard

Depends on how your previous grades were/are.
If you made an average 75 and are now making a 100, your total grade would increase to an 88.

Take your current average, subtract from your expectation, divide the result and add it to your current(bad) average. This is how much you can improve.