My understanding is that there is a GPA for each year, and also a cumulative GPA. Suppose your first year GPA was 2.0. You could get a GPA of 3.5 by doing well in second year. That would give you a second year GPA of 3.5 and a cumulative GPA of around 2.8 or 2.9.
You should also be aware that North American university grades do not depend only on examination results. A substantial part of each grade depends on course work. The final exam typically accounts for between 20% and 50% of the final grade. Therefore you can do pretty well just by showing up, participating in class discussions where possible, and doing all your assigned work and submitting it on time.
It is not necessary to be brilliant to be an A student in a North American undergraduate program. It is probably sufficient to be a conscientious student. And, of course, to be sufficiently fluent in English.
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