Yeah, "bored" is a shared symptom which can come from a broad set of causes which call for different responses.

Some non-exhaustive examples:

1. Bored because they already knows the material.

2. Bored because the particular in-class activities are not engaging but they'll make more progress at home.

3. Bored because the entire subject seems like pointless memorization.

4. Bored because of a neurochemical issue.