I can't join back my highschool network!

I accidentally deleted my high school network, and went to re-join again. But Facebook informed me that I must add friends, and they must confirm if I go to the school. I added many of my high school friends--again, and nothing seemed to help. How many high school friends must confirm that I attend the high school? Could this be possibly a glitch? like 95% of my friends are from my high school, so I don't understand why Facebook won't let me rejoin back my network.

Hello,
I believe you cannot just directly add your friends. You need to attempt the join the network, in which facebook will then request confirmination from someone in that network. Then you can follow its directions to ask a friend to confirm.

I did that too as well, many times.
I added other friends from my school which I haven't had on my Friend's list before and it is still the same.