Can I beat up and threaten a classmate for a flash light?
Why do you want to beat him up over that?
He stole my flashlight and broke it intentionally
I can see why you're mad. It sounds like there must be more to the story. Why would he intentionally take and damage your flashlight for no reason?
I don't know, he must be a bully.
What he did was really wrong to you, have you told a teacher yet? If you get the teacher or principal involved they can make his parents replace your broken item and put him in detention.