Hi Abhay.
As you have completed your 10th from open school and 12the from bihar state board. Then this won't be any hurdle for you.
You can still go for IIT.
No problem there.
But you need to score very high to get a seat in IIT.  But your boards will not be a problem definitely.

Give your best shot now.
Good luck. Feel free to revert back for any further queries.

If you like the answer, kindly upvote.

No problem. If you can manage to get under 10k rank, then you can definitely get IIT'S...