High marks do matter. When I applied to McGill many years ago the minimum standard to even be considered for admission was 70%.
To get ahead in to-day's world one needs at least an undergrad degree and possibly a graduate degree. Let's use Bank of Nova Scotia as an example.
The late Cedric Ritchie at age 17, the son of a potato farmer, began working as a
teller in The Bank of Nova Scotia's
Bath, New Brunswick branch. He rose to become CEO and Chairman. He was followed by Peter Godsoe,
Peter Godsoe
"he graduated from the
University of Toronto Schools before receiving a
Bachelor of Science in Mathematics and Physics from the
University of Toronto and a
MBA from the
Harvard Business School. He is also a
Chartered accountant and a Fellow of the Institute of Chartered Accountants of Ontario (
post-nominal FCA)."
The days when a person could join one of the big banks (or most employers) with just high school leaving and rise to CEO or even much lower in the ranks are long gone. Employers also look where you got your degree. In Canada, degrees from the major universities are the most valued.