Hello Monali. Thanks for contacting Careers360 and we hope we will be able to answer your query. 

Please note that the mock tests are provide by the exam authorities and many websites on the Internet just for you to get a feel for practice. So, there will be no answer keys.

If you want to practice mock tests with solutions, I would like to direct your attention to this Careers360 article for more information:

• https://engineering.careers360.com/articles/jee-main-sample-papers

Hope this helps you and all the best!