Hi ishvi. so, i am not an IIT faculty or an expert, but heres what i do.
doing the basic rules and questions from the ncert text book including mesillineous and supplementary exercises. make sure urelf that u really did understand what the questions asks, and also find a genral form , so that when u see a question u can actually know which equation or what to deivde with.
next step is to revise the required formule atleast twice a week, so that u dont forget them, most of the time i face difficulty in remebring which forule to use and i miss out that question.(trying using arihant handbook for maths)
next, follow a good book other than ncert through which u can actually understand and also exerice as many questions as possible. check out the self study package where u can actually practice many problems.
hope this helps you.
(from a student )