It can be easy to ignore aggressive behavior in young children, but that will soon become problematic for a school when another child gets hurt as a result. This is why it must be dealt with quickly, and you have to be firm but fair with young children.
You should also try to see where the aggression is coming from. Is it coming from other students, their parents or any forms of violence that they’re exposed to? At such as a young age, they could be a victim too, and you should always aim to find the root of the cause to stop bad behavior at a young age.
Children should always have realistic goals, and they may feel frustrated with their schoolwork. There are so many different reasons why a child could be behaving poorly, but if you let the student know when they’ve misbehaved, and attempt to find out why they are behaving badly, you can put an end to it before it becomes a serious problem.