what should I do if I am stuck at one of the questions

Hi Aspirant

From your question I presume you mean you are trying to solve a particular question and you cannot solve it at the time being.

One must try a question as much as possible but then again that should not hamper any thing else.

If you cannot solve a question even after multiple attempts it is better to leave that question for the time being and proceed to other questions.

Seeing the question after some time helps at times. But sometimes even this might not be of any use in that case one must look at the solution or ask for help from friends or professors.

Hope this helps and All the Best.