hey

The cut-off varies every year depending on the performance of the college considered of past years and the number of students opting for that college.But mostly only a difference of 200-250 rank is observed so there are high chances for him to easily get a seat in the first phase counselling.

Just to be safe do add colleges accepting rank upto 90,000 so that even in the worst-case scenario he would at least get a seat reserved by the first phase counselling.

do go through the link to find about the colleges which he can get into:

Hope it helps!