How to change page title for admin users to easly find which admin page they are
You can use shortcut bar, 


  The Shortcut module provides a toolbar on the top of the page to which
  you can add links. This toolbar is site-wide, so any links added will
  be visible to all users who have permissions to see the Shortcut
  toolbar. This is useful for creating links to commonly-used pages
  within your site. You can organize these links in multiple sets of
  shortcuts.


Click on the + sign as shown below in any page you want to bookmark



You will see links next to Add Content , Find Content like below



Explained in link given above...