Try creating different account types from http://yoursite.com/...ccount-type and label them accordingly (Label 1, Label 2, Label 3, Label 4, Label 5) also create user roles (http://yoursite.com/admin/users/roles) in that order.
Then download this plugin http://www.oxwall.org/store/item/657 from the store to link roles and account types together on sign up.
thanks obasi, but what i mean is how to make users register on the Group plugin directly from the signup to be automatically be enroll on the group. eg: for a student of AAU to select AAU during signup and be automatically be on the group plugin without re register on the group after signup and the same thing for UNIBEN to select UNIBEN during signup and so on, so that AAU Student will not be able to register on UNiben group on the Group plugin.
Pls try to understand me brtter.
i hope on you all help.
thanks