If anyone who takes 3H2 and 1 H1 can get scholarships, then all jc students will be able to get it.
truth to be said, 4 H2 As may not get a scholarship too.
There are quite likely Singaporean students with
1) 4 H2 1 H3
2) 4 H2 1 H1
3) 4 H2 1 H1 1 H3 (not sure if have this)
4) 4 H2 1 H1 2 H3 (not sure if have this)
5) Various awards from the different local and international Olympiads
The above are core subjects, excluding GP / Project Work / Chinese, and also excluding various other CCA achievements.
Not trying to discourage you, but with 3H2s and 1H1, you are ranked way behind. Unless you have some exceptional talent or leadership ability, and I really mean exceptional, it's tough to even be shortlisted for most of the government scholarships.