My guess is you can't, certainly not under IHL status (which is
for full-timer students). Offically, I don't think you'll allowed
to defer unless the call-up actually happen to clash with
examinations.
You didn't mention the nature of your coursework or class schedule,
so it's hard to say whether your commander would give you time off
for them. But he's certainly the one who holds the power to let you
skip an ICT itself, so submit all available documents - offical
acceptance of study application, enrolment date, specific course
name/duration, academic timetable, etc. - & let him make the
decision. If you aren't a KAH & the unit has adequate cover,
you could get your wish - but be prepared to do make-up ICT later
in the same workyear.
FYI On & off, some of my old reservist kaki's used to bring
textbooks to camp for revision study on the side. But they were
more part-time students with commercial schools & such; none of
them were doing Masters with NUS or NTU.
