How to switch between user roles
There are couple of module available to do this job. Hope this will be helpful

1. Masquerade


  The Masquerade module allows site administrators (or anyone with
  enough permissions) to switch users and surf the site as that user (no
  password required). That person can switch back to their own user
  account at any time.


2. Role Switcher


  Role Switcher module provides with an option to change role for
  testing purposes. It creates 'roleswitcher' role and grants it
  permission to administer permissions which makes possible to switch
  back to the original role the user had. The module provides a
  roleswitcher block and a page, /roleswitcher.