Not true.
Using EM3 as an example, IMO I think it's not really
suitable.
Let use ITE as an example. I see people working there working
doubly harder than poly students and they are offered a place in
poly after their education in ITE.
Failing doesn't mean you fail forever. You yourself have to work
even harder to prove that you're no lesser than your counterparts,
then you'll be offered a chance.