Hello Aspirant,

According to the rank mentioned by you in the question there are quite low chances for your son to get CSE in PES South campus because if we go through previous year's cut-off trends of CSE branch in PES University then it trends around 1000-1100 but your son's  rank is quite high as compare to the cut-off. Similarly if we go for ISE then your son have some chances to get it if he belongs to any of the reserve category as per previous year's cut-off trends.

For more details kindly refer to the link given below :-

https://engineering.careers360.com/articles/pessat

I hope this information helps you.

Good Luck!!