If you have selected a stream, the list will display subjects that have been preassigned to them. So, a subject you need may be excluded from the list. You can search for them from the database by:
Scroll to the very bottom of the page, click on
In the popup, type in the subject name or syllabus code in the search bar at the top right
If the subject is available, they will appear in the list
Tick the checkbox at the most right to select the subject and click
Once your subject successfully added to the list, tick it again from the list to register for your exam
If you are unable to find your subject or need help, please contact the exam centre.