Guide to get into university?

I recently took up interest in seeing what it takes, what is involved, and if I could get into a college or university.

A long story but I slacked through high school and actually failed physics 12... yah I know (mr physics theories here) . I graduated in 2001, and passed all other courses, finished with math 11, chem 12, physics 12(F), English 12, Local History 12.(i think)

So, I realise there is alot of members here who have been there done it and know all about it.

Is it too late? Can you take tests that can redeem your potential?

I have been spending years doing independent study as a hobby, but obviously not alot in the mathmatical department..

Anyhow, I am refering mainly to canadian universities, so if you have any information on the top of your head that you'd like to share or know of any really good links, fire away, I am all ears.