You need to register to purchase the tests. You can see the tests available, prices and so on before you register by visiting the 'Costs and Contents' section of the site.
How do I register?
Clicking on the 'Register' link will bring up a form where you will need to fill in some basic details about yourself. We respect your privacy and will never mis-use your details, see our privacy policy for more details.
Once you have registered, you will be sent an email confirming your details and provided with a screen where you can log in. After logging in for the first time you will be taken to the cost and contents screen, where you can buy the learning material.