The customised test code is a login key that will enable you to access a test that has been tailored to you, called a “customised test”, in general provided by a school, higher educational establishment or professional organisation.

If you have not yet created a Pix account, go to pix.org then click on "Enter my code" :

If you already have a Pix account, just log in and go to the “I have a code” tab and enter it:

You can then access your customised test, which you can stop at any time and carry on later if you wish, by entering the code again or through the “My customised tests” tab. At the end of the customised test, you will have a screen with a “Send my results” button, which will send them to your school/university/organisation.