Hiii

For the test series and quizzes we have entrance360. You can use that for tests and studies, and here on careers360 you can put up your queries.
I am providing the link for entrance360. 
https://www.entrance360.com/
On entrance360 we have all the course preparations available may that be NEET, JEE, BITSAT etc.
Do check it out, hope it will help

Thanks!