Hello Dipali garu,

You haven't mentioned the category. So ,I'm giving you last year cut off for all categories

Gen:89.7548849

Ews:78.2174869

Obc:74.3166997

Sc:54.0128155

ST:44.3345172

Pwd:0.1137130. This year total 869010 students attempted for jee January. The students going to attempt in april are 1200000. You can calculate your rank using formula (100-percentile)*869010/100. That is 2,01,610.This is his approximate rank. You can understand whwre he stands and according to the cut off you will know whether he will qualify or not.Surely make him prepare for jee april so that the chances of getting NiT may come. If he only want to join in BITs tell him to prepare for that. Whatever the syllabus for both is same and  BITs will have extra aptitude and reasoning.So, ask him to write both the exams . Wish him Luck. Hope this is useful. The below link will give the predicted colleges.:

https://engineering.careers360.com/jee-main-architecture-college-predictor