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I never know what these 'grade' designations mean. Anyway, it appears to refer to 15 to 16-year-olds. https://en.wikipedia.org/wiki/Tenth_grade

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In Israel, first grade is for 6 year olds, getting out of kindergarten and into elementry school, so if you want grade to age conversion just add 6, ie 10th grade = 16 yo

So first grade is 1 + 6 = 7 by your algorithm?

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