Three things…
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Most important: what’s your budget? Will you be needing financial aid?
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If your country uses a different marking system, the online GPA converter might not be accurate. If your country sends a lot of students to the US, admissions officers will be familiar with your original marking system. And maybe post that here too as there are many CC users here who know international schooling systems.
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Lastly, to avoid confusion among users - if your son is graduating high school next year, he’s an “S24”, not an “S16”.