hello sir!! congratulations sir as your son has qualified for advance exam
with 48.37 percentile in jee mains exam he would be getting the following colleges :

University Institute of Engineering and Technology, Kurukshetra

Electronics & Communication Engineering

University Institute of Technology RGPV, Bhopal (1986)

Civil Engineering

Jabalpur Engineering College, Jabalpur, (JEC) (1947)

Mechanical Engineering

Samrat Ashok Technological Institute, Vidisha (1960)

Electronics Engineering

Indira Gandhi Engineering College, Sagar (IGEC) (1981)

Civil Engineering

and many moree...

I m providing you a link for  knowing colleges in which you can get a seat for your rank  in JEE MAINS  and category,please see the following link :

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

Https://engineering.careers360.com/jee-main-college-predictor?utm_source=C360&utm_medium=qna&utm_campaign=jee-main-college-predictor

All the best

Thank you