Hi Quirke,
To address to some of your concerns.
I am not sure about the Physics aspect for SPL or PPL. Correct me if I am wrong but for CPL and ATPL I think you will need phyiscs.
You may want to look at this URL.
Flight Crew Licence
http://www.caas.gov.sg/caasWeb/expor...load/sasp1.pdf
You can try to join SYFC. If they accept you, well you may go thru their PPL selection. I feel that it is a good channel to learn flying especially at you age. Selection can be tough, but once you made it. You can also choose to fly for military too.
The flying experience there can be useful for your future endeavor if you wish to venture into Airlines as a cadet pilot.