What should I do about him?

This boy in my year 3rd/10th, we are both 14 I'm a girl by the way:)! Okay so this boy has once smacked me over the head to hard my neck had pains for days and today he swung something into my eye and for a while my vision, only my friends know about this, my mum of dad don't my auntie only knows about the first thing. This is happening in school, he also shouts a whole load of verbal abuse at people, and weird stuff like my friend has a baby sister who's 3 weeks and he's like Ooooh Mia;)! The babys name, and we are just like Ew you creep, do what should I do?