It is Greg's locker, the only one you can click on.
If you have found Greg's journal entry, he says his locker is 5 away from Holly Hills' locker, while Chirag's is only 2 away. It is the one with the broken lock. This would make Holly's either the 1st or 5th of the row of lockers, and Greg's would be either the 6th or the 10th.
But Greg's locker is actually the 8th from the left, which is 5 right from Chirag's locker instead. Use his combination (9, 37, 15) to open it.
you must get the paper with the numbers on it. it is on the tree outside by the school
When you unlock Gregs locker the guide is in there
It is in the school.
you look for the locker that is different then the others :-D
Open Greg's locker.
Open Greg's locker.
you go to greggs locker
5th lockers from the broken locker go to the right
His locker combination is 9-37-15.
you have to get the scrap of paper with the numbers on it.
9 37 15
you cant.