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Pre-school(toddlers, lower kindergarten, upper kindergarten)
Primary school(1st grade to 4th grade)
School (5th to 7th grade)
Upper school (8th grade to 9th grade)
Secondary school is the 10th grade
After the tenth grade you choose your "stream" - humanities (Arts), science(PSTEM), commerce(business) or vocational(trades)
Then once you choose, you go for higher secondary which is 11th and 12th grade
Then comes college, 3 years for majority of them. A few exceptions are 4 years, but those are rare.
Masters is 2 years. Ph. D. Is 5.