Hello Sagar

Since you want improvement in level of questions, you can refer to DC Pandey. It is really a good one. You will get questions of all types of difficulty indeed. The level starts from easy and at the end there are the best possible questions. Or, if you want, you could also refer to the Cengage series and Concept of Physics by HC Verma( these two books are for JEE preparation though). Also, keep in mind that if your fundamentals afre clear, you don't have to solve a huge number of questions, solving a handful of them (but of different types) will be sufficient. Refer to the NCERT books for understanding the basics.

I hope this helps. All the very best!!