Dear, 

If you are a 10+2 student you must go through NCERT books. These books are designed in way from easy to hard problems, solving them regularly strengthen your weak parts. 

Helllo Aditya singh !

1)If you don't understand something, focus on mastering that topic before moving on to the next topic. 

2) Work example problems and check your answers to gain practice with every lesson.

3) When beginning to work a Math problem, do not "map out a path from problem-to-answer" in your head before writing anything down. 

4) When you study and do homework, try to find a quiet place to do it.

5) If someone asks you for help, try to explain the topic to them as best you can. 

Aside of this i wanna inform you that  :-

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This is a recipe for disaster.

Maths is all about practice, the more you practice the more you will learn. Start with your basics. Ncert is of the best books to improve maths is your school life.