Final answer:
A Course class tracks up to five students and includes methods for adding students, calculating test score averages, and printing a roll. A driver class would manage these functionalities.
Step-by-step explanation:
Designing the Course Class:
To achieve the objectives of the student's request, we will define a Course class in a programming language. This class will have the ability to add students, calculate average test scores, and print a roll of the students. A sample implementation in a language like Java might look like the following:
class Student {
 // Student details not shown
 double getAverageTestScore() { /* Method to return the average test score */ }
}
class Course {
 private String courseName;
 private Student[] students;
 private int studentCount;
 public Course(String name) {
 this.courseName = name;
 this.students = new Student[5];
 this.studentCount = 0;
 }
 public void addStudent(Student student) {
 // Code to add a student to the course
 }
 public double average() {
 // Code to calculate the average of all students’ test score averages
 return 0; // Placeholder return
 }
 public void roll() {
 // Code to print all students in the course
 }
}
Furthermore, a driver class would be responsible for creating a course, adding students, printing the roll, and printing the course test average as requested.