quirke,
I do think the purpose of school is to teach one how to learn, regardless of subjects.
Explore all options, even the poly course. When I wrote about exposure, I was referring to the course with Temasek. It is certainly a better option (and wider exposure too) than worrying about cadetship or self-paying for a commercial pilot licence now.
Honestly, (presumably the course is) 3 years is a good tradeoff to find one's career direction. Regardless, make a decision and put in your best.