"high school" vs "secondary school", "grade" vs "form"?

Question:My lecturer made me distinguish between "high school" and "secondary school", "grade" and "form".
Please help me! next Wenesday I gotta give him the answer!

Answers:
High school is grades 9-12, secondary is 6-12, "form" is basically a word they use for "grade" in places like Australia.

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