A 63 would be 3.3 (B+).
Your guidance counselor or principal (or whoever fills your counselor form) would provide a scale indicating how
Something like…
75: A+/top 2% nationally
73: A/top 5% nationally
70: top 10% nationally,
65: top 15%
63: top 10% in province/city
60: top 20% nationally
etc.
(I’m pretty sure the 60/top 20% nationally is correct but the rest I give as an example so try and look for numbers. Those are usually found on Ministry of Education or such.)
All the way to E and F (and the percentage who get those results nationally)