I am in inter 2nd year ie 12 class I am targeting for jee mains and advanced so will u pl suggest me how to plan so far I didn`t start my preparation

First of all need perfection in basics. Go according to the topic weightage and work out the problems on the parallel track. Choose the subject in which you are strong and constant work out so that u can score maximum from this and becoming strong in basics of weaker subjects makes u to cross the cutoff range. All the best