Hello Ananya!

You've to ask this to yourself:
How well do you think you did at JEE Main?

1)Was it that you Know you could do way much better than this and what you got was not worth for your caliber and it was just a bad day?
2)Or do you think you did Okay/Good?

If 1) , you must be already good with your concepts and just need to give a few mock tests before BITSAT and you'll be good to go.
You can utilize this time to prepare for Advance. As your rank is pretty decent.

If 2), You can now focus completely on BITSAT. I'm not saying that you should completely ignore Advance, but the fact that IITs just have around 11-12k seats in total and I'm assuming you're a General category student, chances of getting into into IITs are obviously low.
So you can start giving BITSAT mocktests, solve the few different category questions that aren't in JEE Mains (English and Logical reasoning) so that you won't lose marks there.

So the choice is completely up to you.

Hope this helps :)
Best of luck!

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