BSOEF

Hi

i live in montreal and willing to intend to inter-dec "cegep"
i'm 23 and just started going back to school, i dropped out when i was 15...and trying to get my life back together
is too late to go to college ??
and i was wondering how do you apply ?? do you really need to get good grades ???
like i said earlier, i live in montreal, and the way it works around here is by percentile, in our report cards.
if i get an average of 65% in french, 90% in math and 90% in english including all the other units required, will it be enough to be accepted ???

anyways thanks for the answer and help....really appreciate it