Here

package Student;

import java.util.HashMap;
import java.util.Map;

public class Student {
    private final String name;
    private  Map<String, Integer> studentScores = new HashMap<>();
    private final double studentAverageScore;
    private final double grade;

    protected Student(String name , Map<String,Integer> studentScores, double studentAverageScore,double grade){
        this.name = name;
        this.studentScores = studentScores;
        this.studentAverageScore = studentAverageScore;
        this.grade = grade;
    }

    public Student() {
        name = "";
        studentAverageScore = 0;
        grade = 0;
        studentScores = new HashMap<>();
    }

    public String getName() {
        return name;
    }

    public Map<String, Integer> getAllScores() {
        return new HashMap<>(studentScores);
    }

    public double getGrade() {
        return grade;
    }

    public Map<String, Integer> getStudentScore() {
        for (int i = 0; i < 5; i++) {
            studentScores.putIfAbsent("Test " + i, (int) (Math.random() * 100) + 1);
        }
        return studentScores;
    }
    public double getStudentAverageScore() {
        int sum = 0;
        for (Map.Entry<String, Integer> entry : studentScores.entrySet()) {
            sum += entry.getValue();
        }
        return sum / 5F;
    }

    public double getStudentGrade() {
        int sum = 0;
        for (Map.Entry<String, Integer> entry : studentScores.entrySet()) {
            sum += entry.getValue();
        }
        return sum / 100D;
    }
}

THE APP

package Student;

import java.util.ArrayList;

public class App {
    private static final ArrayList<Student> studentArrayList = new ArrayList<>();


    public static void main(String[] args) {
        Student student = new Student();
        Student student0 = new Student("okay", student.getStudentScore(), student.getStudentAverageScore(), student.getStudentGrade());
        studentArrayList.add(student0);
        Student student1 = new Student("okay", student.getStudentScore(), student.getStudentAverageScore(), student.getStudentGrade());
        studentArrayList.add(student1);
        Student student2 = new Student("okay", student.getStudentScore(), student.getStudentAverageScore(), student.getStudentGrade());
        studentArrayList.add(student2);
        for (Student s : studentArrayList) {
            System.out.printf("Student name %s | student scores %s  | student average score %.3f | student grade %.2f \n", s.getName(), s.getAllScores(), s.getStudentAverageScore(), s.getGrade());
        }
    }
}