[quote=@Conscripts]
My apologies for disappearing without notice. I was on the plane for nearly two days, and is pretty tired. But I will try to make a post now. 

EDIT: Posted. Though I wasn't sure about the school ground's design. I mean how many entrances does the school have?
[/quote]

One main entrance/exit, an emergency exit, and a service entrance/exit is probably enough and within modern world common sense. Let's go with it in order to not make this more complicated than it needs to be.