Quick Question About "Year in School" on AMCAS

[TheEugenius]

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So I am in a Canadian university, and all of the courses I have taken have been assigned 3 credit hours on my transcript. I have taken 10 courses per year. Would it be correct to say that the 10 courses in my first year were 'freshman', the 10 in my second year were 'sophomore', the 10 in my third year were 'junior' and the upcoming 10 in my fourth year are 'senior'?

I am slightly confused about the credit hour ranges part.

Thanks