so i decided to check from the Ministry of commerce near Muntaza signal if you don't know...right side after Muntaza signal...there you can ask regarding permit for selling coffee in school Primary and Secondary school...Upppsss! They said if you are sure that the school has permit to operate this selling thingy...then they do spot checking....regarding this....i just hope they have....anyway, the safe side is to show the school's business permit for coffee. You are right If in doubt directly ask to the right person to get a right answer....that's what i did...