Why are students not showing in the markbooks?
If a student is not showing in a markbook usually it means that they need adding to the assessment class.
To check this go to Admin > Classes > Add students to class (tab).
In this area select the Year and Form of the student you need to check. This will then show a list of the students in the year and form you have selected. Next to each student you will see the assessment classes (markbooks) they are assigned to.
In this example you can see the student Tom Collins has not been assigned to any classes:
To add the student to the assessment class so that they will show in the markbook simply check the class name above the list, check the student and click Save Classes. As shown below: