GMETRIX learning resources are availble for Microsoft Office Specialist (MOS) courses.
The access code is specific to the particular course you have registered for. By logging in to the e-learning site you will then have access to interactive resources to help you learn and understand the subject. The resources includes practice tests and electronic copies of the Microsoft Official Courseware books.
You should attempt the tests in both training and testing mode and it is recommended that you make full use of all of the available question pools. Keep attempting the tests until you are confident of your knowledge. I recommend that you do NOT just keep doing the practice tests as you may end up just remembering the particular questions and answers, I suggest that you use the tests to identify what areas you need to work on and as a guide to tailor your study.  The test are useful if you use them effectively and not just frequently to the point of over-familiarisation.
The course is designed to be self-paced so that you can study when it suits you. However, in order to keep track of progress we are limiting the availability of each course to a few months.