revision help for year 9 maths

now I know I shouldn't be stressing out about revising in year 9 since I haven't even started my GCSEs yet, but the thing is I want to become an astronomer, and to become an astronomer I need to do a-level maths, and most sixth forms/colleges require you to get at least a 6 in GCSE maths, BUT the thing is my school said that that if you aren't in top set maths, you automatically do foundation maths and I'm in 3rd set, and that might not seem that bad but my school only has 4 sets, yea...

and I know we're only like 2 months into the school year but i barely learned anything in year 8 because my poor teacher could not control the class one bit and I couldn't concentrate for the life of me, and now I'm in the exact same situation, my teacher can't control the class and I can't concentrate. so I'm just gonna try and revise for my end of term test to see if I can move up soo any tips?

now I know I shouldn't be stressing out about revising in year 9 since I haven't even started my GCSEs yet, but the thing is I want to become an astronomer, and to become an astronomer I need to do a-level maths, and most sixth forms/colleges require you to get at least a 6 in GCSE maths, BUT the thing is my school said that that if you aren't in top set maths, you automatically do foundation maths and I'm in 3rd set, and that might not seem that bad but my school only has 4 sets, yea...

and I know we're only like 2 months into the school year but i barely learned anything in year 8 because my poor teacher could not control the class one bit and I couldn't concentrate for the life of me, and now I'm in the exact same situation, my teacher can't control the class and I can't concentrate. so I'm just gonna try and revise for my end of term test to see if I can move up soo any tips?

now I know I shouldn't be stressing out about revising in year 9 since I haven't even started my GCSEs yet, but the thing is I want to become an astronomer, and to become an astronomer I need to do a-level maths, and most sixth forms/colleges require you to get at least a 6 in GCSE maths, BUT the thing is my school said that that if you aren't in top set maths, you automatically do foundation maths and I'm in 3rd set, and that might not seem that bad but my school only has 4 sets, yea...

and I know we're only like 2 months into the school year but i barely learned anything in year 8 because my poor teacher could not control the class one bit and I couldn't concentrate for the life of me, and now I'm in the exact same situation, my teacher can't control the class and I can't concentrate. so I'm just gonna try and revise for my end of term test to see if I can move up soo any tips?