You can easily find all the tests that are currently open for registration. This instruction will show you how to do this.
Select the menu button in the upper left corner of the home page, and choose 'Coarse Catalog'.
Click the filter button
Check the checkbox 'Only open for test enrolment (xx)'. The number shown between brackats behind this option, represents the number of courses found of which one or more tests are currently open for enrolment.
Finally, click on the button 'RESULTS (xx)' to select the courses.