One way to get into an advertising or design school is to have someone else pay for it.
Check out this scholarship being offered by Langara College in Vancouver.
2011 Rethink Scholarship at Langara Call for Entries from Rethink Canada on Vimeo.
Their site says:
We think it's important to nurture young talent. That's why we teamed up with Vancouver's Langara College. Together, we offer one aspiring art director or designer the chance to win a two-year, fully paid $18,000 scholarship to Langara's Communications and Ideation Design Program.