You haven't mentioned the State you belong to. This is important because the cut offs are different for Home State Candidates and Other State Candidates. So do please do help us with that information.

Meanwhile, Your rank can be predicted by using the formula, (100-your total percentile)*869010/100. In your case, your approximate rank would be 28677 . 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.

But your son might have decent chances in:

NIT Warangal

NIT Rourkela

MNIT Allahabad

NIT Calicut

VNIT Nagpur

Now to predict colleges, please use our college predictor: