Hey Akshita!

As you mentioned you are clear with the concepts of subject.So,all you need to fetch good marks in JEE mains is practice.

To get familiar with the real JEE mains scenario give mock tests and try to recall your mistakes,write down your mistakes and work on it.

If you look at the solution directly and solve question it will more like mugging up and you will face problem in solving questions during exam.

These links have sample and previous years papers-

https://engineering.careers360.com/articles/jee-main-question-papers/amp

https://engineering.careers360.com/download/jee-main-sample-papers-previous-years

These links have JEE preparation material-

https://learn.careers360.com/engineering/jee-main-preparation-material/

I hope this answer helps you!

Feel free to ask if you have any more queries.

All the best!