What should I do...

My girlfriend's birthday was on August 28th. I wanted to give her a birthday present, but she has a "school achievement test" coming up soon, which is pretty important for her grades as she's entering 9th grade. So we decided I'd give it to her after the test. For one gift, I was thinking of making her a handmade keychain of a Shima Enaga bird because she loves them. For the other gift, she told me, "Anything with your sense is fine~." When it was my birthday, she mentioned something like, "A new wallet as a gift…" But I want to give her a practical gift that shows I really care about her, not just a keychain. I'd love to hear your advice and suggestions! Of course, since she said "with my sense," I won't follow your advice exactly! I just want to use it as a reference!