As per the Building rule Kerala these are the requirements to get Supervisor A licence.

1.Diploma in Civil Engineering and having completed 4 years experience as supervisor-B. Note:- For counting 4 years of experience, continuous practice as supervisor under Kerala Building Rules, 1984 shall also be taken into account.

or

2.Any person having eight years experience as supervisor B. Note:- For counting eight years of experience continuous practice as supervisor under Kerala Building Rules, 1984 shall also be taken into account.

Or

3. Any person having valid registration as Supervisor (Special) under Kerala Building Rules, 1984 shall be eligible for registration as Supervisor A

These are the requirement as per our limited knowledge before applying make sure that you have referred the latest Building rules and also confirmed from the licensing authority.