It depends why you find it boring.

If you think it'll never be useful to you, you should try and think how it could be useful. Everything will be useful somewhere in life, otherwise they wouldn't teach it to you.

If you find the subject too easy, try thinking about a more complex problem within the subject, and explore the subject in greater depth than you're taught.

You should also try to not get distracted by others. Their boredom shouldn't make you miss out on the class.
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