Hello Steeve,  Good morning,  along with theory,  problems and equations are also equally important to achieve good marks in jee mains. If your theory concepts are good then it will not difficult for you to solve problems.

and as you said you are solving previous year question papers,  so you might be aware about importance of problems. Solving question papers is really good practice. Keep it up.  And try to clear your concept in problems also.

I hope it will help you more.

thanks.