Respected sir,

I am not sure about this as it has been a long time since I had any one of those.

Getting marks will depend on subject knowledge and time management. Learn & practice. Dont completely rely on other way !!

Coming to mock tests, practice at least 5 - 8 exams. Just dont do for sake of it, rather try to check your subject knowledge honestly and improve time management skills.

Once you feel you are good with subject knowledge then you can practice more.

Thank you.

Dear Ayush,

You can check below link for full online mock test series it will help you to analyze your preparation level and to know your strength and weakness. 

https://www.entrancecorner.com/knockout-bitsat/

Good Luck!!