You have to enquire whether it is easy to switch to other
faculties in NUS/NTU/SMU if you enter social work in poly, or you
have to stick to social work.
Are you wanting to enter social work in poly cos it is slack and
interesting?
Do you have the interest to becoming a social worker?
Do you still like your JC environment?
JC is the more direct route for entering uni. Only 20% of poly
grads who take 3 years to complete the diploma, can enter local
uni.
The issue about L1R4 is not that important. You could be the
most outstanding student in social work if you work hard.
Poly environment is also quite hectic, from what I have
heard.
Do consider carefully.