Hey Pavan.

See ur son marks is good for him to bag a seat in the private college but it might be not be that much enough for the govt college to pursue ur higher studies in the field of ur interest under MBBS courses. for the rank I m providing u a link for ur help.

https://www.google.com/url?sa=t&source=web&rct=j&url=https://medicine.careers360.com/neet-rank-predictor&ved=2ahUKEwjetunh6obiAhVV7XMBHTQSC2sQFjABegQIBBAB&usg=AOvVaw3nJRxVLJehrXX9hGhSBApe

Ask if any query. Good luck