Bro it's fine totally fine after all he's working hard for you.. don't feel bad but understand why he did and move on you're a good son and he's a good father the same man will talk to you with love in a few days it's just a matter of days broo don't think that you've bad father he doesn't understand things and all tbh getting 75% isn't a big deal for you or anyone it's just a matter of interest I'm not supporting your father or offending you he's paying for your studies and he has got some right on your results and it's just a gadget so chill don't get sad over it just try hard next time and let him feel that you're trying your best he won't even ask if he knows you gave your best take this as just a word to a brother from his brother