Revision Tips (im cooked)

yall i got probably one of the most biggest exams boutta soon happen in my LIFE. and if i fail this shit without getting 7 or above my ass is kicked from having a roof over my head. I need revision tips asap, like genuinely ones that are able to work. i am in the low end, to get to a 7 man?? I HAVE BEEN CHEATING MY WAY UP THIS WHOLE TIME I DONT EVEN UNDERSTAND SHIT IN MATHS, nor biology.. chemistry, physics… ill put my current grades up, (im in the UK, doin gcses)

Eng Lang: 3
Eng Lit: 4
Maths: 5+ (in reality should be like a 3 but i had to cheat my way up to get to higher)
History: 6
Chem: 7+ (should be like a 5 or 4)
Bio: 7 (again, should be 3, 4 or 5)
Physics: 7 (same thing)
Business: 5
PRE or RE: (wtvtf +1 means, i got a grade 7 on my recent test)
Spanish: 4+

i get its my fault or whatever for cheatin durin the tests yada yada but YOU DONT UNDERSTAND, i had one chance to get into separate/higher science/maths for my parents to be proud, or else they woulda never spoken to me again. cant blame me when movin up from foundation maths to higher in year 9 expecting me to know all this pythagromomotriangle shit man.
my science exam boards are AQA and the rest except for pre and maybe spanish is edexcel.

I NEED REVISION TIPS!! my first exam is gon b history cold war then the next day bein germany AND ON THAT SAME FUCKING DAY ENG LIT. from the 7th to 27th or smth may. anyways, please pass ya gyal revision tips and your personal experiences w handlin exam shit.

(even if its just one person that’d make me believe i can get that academic comeback (i never had one))