x2.
As I mentioned earlier, I am highly perplexed as to why the NUS
admissions allow you to have either Physics or Chemistry as part of
the admission criteria. The bottom line for ANY engineering course
is this: you MUST have a solid foundation in Physics and Maths.
Anything less, and you'll be screwed very badly.
If I'm not wrong, NTU actually allows A Level Arts students to go
into engineering. In fact, NTU has a more established aerospace
department than NUS. They provide additional basic Physics and
Maths classes to those without A level Physics and Maths.
However, I strongly recommend against going there, either. Imagine
having to catch up with two years' worth of A level syllabus in a
compressed amount of time while studying B.Eng level at the same
time. It'll be pure hell, I can imagine.