The locker (presumably Greg's) is 5 lockers to the right of the one that has the broken lock on it (3rd from the left). The combination is on the slip of paper found in a tree. But you don't have to enter it, just turn the dial left or right until the number shows as correct (red).
Open Greg's locker.
Open Greg's locker.
you look for the locker that is different then the others :-D
you have to get the scrap of paper with the numbers on it.
you cant.
Open Greg's locker.
You find the completely white locker, and click on it answered by Danae
It is in the school.
you go to greggs locker
5th lockers from the broken locker go to the right
His locker combination is 9-37-15.
you go to the school go inside go to the bottom right hand corner the 8th locker 9,27,15