It is more innovative to make your own gifts, such as handmade DIY birthday blessing chocolates, hand-painted sun jars with constellations, and creative colorful pictures drawn by yourself. These gifts are cheap but precious to your father. On the one hand, this gift is cheap because it does not cost too much money. On the other hand, it carries your good wishes for your father, and he will cherish the gift you made yourself.
Usually you eat less snacks, save your pocket money, and give your father a surprise, such as a real-life pottery doll, a very personalized gift, as long as you provide your father's photo, you can make it, such as a real-life doll in a beige suit, a golf business gift doll, and you can also make a doll of your father in the image of Superman, which will definitely surprise your father. Of course, he will cherish the gift you gave.
I still think that your father will be happy no matter what gift you give, but if your academic performance is better, then he will be happier. The best gift your parents receive from you is not bought by you or made by you, and seeing you live a good life is the happiest thing for them.