f you're looking into How to Upgrade Your PPL to a CPL here's a detailed look at the exams you need when moving from a Private Pilot License (PPL) to a Commercial Pilot License (CPL).
While upgrading your PPL to a CPL you must clear the written exams set by the Directorate General of Civil Aviation (DGCA). These cover key aviation subjects such as Air Regulations Navigation Meteorology and Technical General. You also need to pass the RTR (A) exam (Radio Telephone Restricted Permit) conducted by the Wireless Planning & Coordination Wing (WPC). This tests your radio communication skills for professional flying.
These exams are crucial because upgrading your PPL to a CPL isn't just about flying more hours it's about proving you have the theoretical knowledge and communication skills to fly commercially. The written exams test your understanding of aircraft systems rules weather navigation and flight procedures. The RTR(A) ensures you can handle radio communications professionally which is mandatory for commercial operations.
Besides these exams:
You must obtain a Class 1 Medical certificate before starting CPL training.
You must complete the required flying hours under CPL syllabus (your PPL hours count toward this).
After completing hours and exams you must pass a skill test (check ride) with a DGCA examiner.
In essence when you're wondering How to Upgrade Your PPL to a CPL the main exams required are the DGCA written exams and the RTR(A). Clear them, plus meet the medical and flight hours requirements and you're on your way to a CPL.