[Centos] File permission

Hello all,

I think my file permission are completely screwed up? I created a file called text file called test as root user and have done chgrp on that file to a group called admin. I have added the users ozzie and root to that group. I then did a chmod g+wr on the test file and ozzie can still not write to the file. If I take away read access from the group, ozzie can still read the file. The group permissions have no effect what so ever. If you add or take away permissions from the other permissions, that will effect the test file. What did I do wrong? Could someone please point me in the right direction?

Thanks all.

Dominic