Going by previous All India cut offs and your rank, your son may have decent chances in the following Medical Colleges:

Aarupadai Veedu Medical College: General Medicine

Meenakshi Medical College: ENT

Sree Balaji Medical College: Paediatrics

Aarupadai Veedu Medical College: Psychiatry

Colleges in Gujarat are tad difficult for this rank. Having said that, this is 2019 data and cut offs change every year depending on various factors such as no.of Candidates appearing for the exam, no.of Candidates qualified, difficulty of the exam, and no.of seats available for each specialisation. Please try our College predictor to check the possibility of other specialisations with you rank across India: https://medicine.careers360.com/neet-pg-all-india-college-predictor