Hello Parent!

You've need to ask these questions:
How well does he think he did at JEE Main?
1)Was it that he knew he could do way much better than this and what he got was not worth for his caliber and it was just a bad day?
2)Or does he think he did Okay?

If 1) ,
He must be already good with his concepts and just need to give a few mock tests before BITSAT and he'll be good to go.
He can utilize this time completely to prepare for Advance.

If 2),
He can now focus completely on BITSAT. I'm not saying that he 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 he can start giving BITSAT mocktests, solve the few different category questions that aren't in JEE Mains (English and Logical reasoning) so that he won't lose marks there.

So the choice is completely up to him.

Hope this helps :)
Best of luck!

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