Please help, what else can be added to this script.

Answer:
Maybe try adding
Principal: "What seems to be the problem here Mr.(name)?"
then make the reacher explain on what is happening or you can just make the narrator say (if you're really lazy to make up words
Narrator: The teacher explains to the principal what did the 2 students did in the classroom.
you can just decide on what will the principal do
Excuse me for the grammar on the lines that I made, if there is any errors there, you can just revise it and fix the grammar. This might give you some ideas after reading the lines that I made. So yeah, good luck with the script!
Explanation: