Your rank can be predicted by using the formula, (100-your total percentile)*869010/100. In your case, your approximate rank would be  111233 . 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. To be honest, this rank might be tad high for NITs even with OBC reservation. Neverthless, you may check the previous years cut offs of NITs at our page: https://engineering.careers360.com/articles/jee-main-cutoff . Now to predict colleges, please use our college predictor: