if you intend to apply to SIA, then you do
your degree first. after that when you’re at least 26 (min age for
singaporean male commercial pilots), apply for the SIA cadet pilot scheme. You’ll have to go through
multiple rounds of interviews and tests and all, and its rather
stringent. Then if you pass all of it, you will be sent for a
CAAS medical, and then after that you’ll see
whether they accept you or not.