Hello dear

You can take online test series by just registering and paying the fee for it.

There are many good Institute and websites which provide test series for jee mains and the test series is most crucial part of your preparation as it helps you to analyse your progress

You can reach out here in the link given below, we are providing you a good stuff with a variety of tests :

https://learn.careers360.com/test-series-jee-main-april/

Good luck