Yes, I think he did. And I love doing something for him that he loved. (Clients sometimes wonder if it is OK to give their Ts gifts or not, but there is no stopping the client if the gift takes the form of a post-it with a grade on it, or other informal expressions of appreciation.)
Just meant it to mean very sentimental. If I had said to him, in the moment, when he told me about the test, "you get an A+ in my book," then I would have labeled that as very sweet. But instead I waited until the end of the session, wrote this note secretly with his grade on it, and then presented it to him with a bit of a melodramatic flair at the very end. This to me made it "corny"--not a bad thing, just kind of a fun and goofy sentimentality.