Wtf should I do about physics class 11 pcb

So my school has started on 27 march already and we have test of 200 marks on every Sunday ever since I have been going to school I genuinely enjoy chem and bio but can’t do shit in physics like I don’t even know the basics I scored 8 in Physics out of 50 whereas 46 in chem out of 50 and 85 in bio
physics is literally shit what should i do to improve it I have holiday for 20 days suggest me something to do