Which word to be used in the following example? "In" or "on."

1. I got 90% in the exam.

2. I got 90% on the exam.

Which one is correct? As I was wandering through an English-learning website, I came across a correction as given in the 2nd example. Expert comments required.
I would say "on."
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actually, in the exam is correct.


British in the exam

American on the exam

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