Here are 5 ways how you can apply character strengths in school.
When you don't have good grades you need to be optimistic to make your grades rise. (You apply optimism)
If you don't undertsand the way the teacher explains you can use curiosity to lean new ways of learning. (You apply curiosity)
By not eating in class you show self-control. (You apply self-control)
By saying thank you when the teacher lets you go to the rest room.(you apply gratitude)
By answering when the teacher ask you something in a happy way.(you a show zest)