Hello,

The thing is you need to practice as much as possible . Honestly it doesn't whether you are practicing Allen test papers or Sri Chaitanya test papers or let's say you are from Kota or not. The most aspect of these things are you should be in practice and revise whatever you have studied till now.

Like in Mathematics you should revise everyday the formulas for it. This way you would excel in jee mains and for BITSAT i would recommend to kindly buy the test series BITSAT or practice the previous year papers to get acquainted with the pattern .