Well brother, I can understand your situation. I know you have worked hard for JEE advanced but I believe your rank would over 35k CRL, so you won't be getting decent IIT which I can recommend you.

Though with OBC, there might be an increased chance of your's getting a seat but with such a rank it is very hard to get.

As, opting a very low rank IIT core branch (which too ahs a tiny little chance) will bring nothing good for you, as these new IIT's lags even the permanent faculty and infrasture to nurture you.

So, I would suggest you to prefer state engineering colleges or decent NIT's.

Also, I would recommend you to do take part in JoSAA and go to through all the round even the spot round. May be, some good fortune can turn your destiny.

Thank You