University exceptance?

I live in Ontario, currently in grade 11. in grade 9 and 10 my marks were at the high 60's. in grade 11 my marks were at the high 70's low 80's. I really want to do well in grade 12 getting a mid 80 or low 90 average. I want to get into engineering at a decent university ex mcmaster or maybe waterloo. i can i make it or our my grade 9 and 10 marks to loww?????
 
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