Sunil you haven't mentioned the State  you belong to. This is important to know because the cut offs are different for Home State Candidates and Other State Candidates. So do please let us know your Home State.

Meanwhile,your rank can be predicted by using the formula, (100-your total percentile)*869010/100. In your case, your approximate rank would be 318665. Let's say the number of candidates for April exam increased to 12,00,000 then your final rank shall be (100 - your total score) X 12,00,000/100.

With this rank, it might be difficult for NIT of your Home State even with ST reservation. You might be able to get a good college through JOSAA. But if you want to appear for JEE Advanced, or if you want to study in NIT, you may have to appear in April session.
For IIIT Bangalore, your rank must be below 5000 and your score should be between 190-250.

Now to predict colleges, please use our college predictor:https://engineering.careers360.com/jee-main-college-predictor