Dear friend, I’m hoping that your special day this year is everything you imagined it to be. You deserve everything that your heart desires! Happy birthday!
Happy birthday to the smartest student I know! I’m wishing you all the luck in your studies, and the best of luck in life. Not that you’ll need it, of course!
Pretty, perfect, and particularly wonderful are just a few words I would use to describe you, my dearest classmate. I’m wishing you a lovely birthday today.