Pls look at the far sight. U dun choose poly or jc depending on
whether the students on more or less "slacking". It depends on
whether you u wan to be?
If you plans to study in any NUS, NTU or SMU, it's more likely u
opt for a JC, on the other hand, if u have specific interest like
filming, mobile computing and stuffs that at the moment, the local
unis do not offer, consider polytechnic as a better choice. For
example, in NP, they are offering chinese mass communication
diploma, which is currently not available in any of Us for what i
know in Singapore.
I think this is far more impt ur own future than whether you
consider ur future classmates' slackness.
Think in the long run.
Think what you want to achieve in ur life and set goals to realise
them.
Remember ur future hold in ur hands.