It has been noticed that some students lack in problem solving just because they don't attempt the questions on their own.

All are advised to atleast attempt the questions twice as per method taught in class..

It is just like putting value from question to formula.

To understand which formula is to be employed just remember the standard type of questions asked for each formula you learn.

Do it topic by topic and chapter by chapter.

" Repeat the example taught by your teacher atleast 2-3 times untill you become comfortable and confident with that method only then attempt new questions. "

Best wishes