hi,

see from beginning of 12th course it is really important to clear your concepts of the syllabus of 11th in physics chemistry and mathematics, you may have seen that this 3 subjects has wide contract with each other, specially there is lots of application of mathematics in physics and chemistry, you need to do regular study and should give every day 1-1.30 hr for each of the paper. it is always need to revise regularly, right now dont jump to solve jee main questions, unless you complete the 80% of the syllabus.

make short notes for the final exams. all the best for your future endeavor.