Permissions don't work like that. You set the permissions on the folders and that combined with the folders owner:group information is how the system decides what access you get.
So file thing1 and be owned by Ramesh:admin_group with 777 (w/r/x for all)
and file thing2 and be owned by Ramesh:admin_group with 033 would be w/r/x for Ramesh but everyone else only has read access.