Do not increment score for wrong checkbox selection

I have a simple quiz app with 5 radio buttons and 5 checkbox. The checkbox question have multiple answers , for such one question there are 3 right answers out of 4 checkbox. When user selects the wrong one among three boxes the score is still getting incremented, how to not increment for wrong selection checkbox.

MainActivity :

[public class MainActivity extends AppCompatActivity
        implements NavigationView.OnNavigationItemSelectedListener {

/**
     * The number of correct answers
     */
    int score = 0;

public void end_Test(View view) {
        EditText nameField = findViewById(R.id.name_field);
        String name = nameField.getText().toString();

        //Called question checking methods
        question_1();
        question_2();
        question_3();
        question_4();
        question_5();
        question_6();
        question_7();
        question_8();
        question_9();
        question_10();

        // Display the test result on the screen
        String test_result = createTestResult(name, score);
        displayResult(test_result);

        // Disabled "End Test" button after clicking on it.
        Button endTestButton = findViewById(R.id.end_test_button);
        endTestButton.setEnabled(false);
    }

public void question_10() {
        // Figure out if the user chose "Ipad" answer
        CheckBox IpadCheckBox = findViewById(R.id.ipad_checkbox);
        boolean hasIpad = IpadCheckBox.isChecked();

        // Figure out if the user chose "Imac" answer
        CheckBox ImacCheckBox = findViewById(R.id.imac_checkbox);
        boolean hasImac = ImacCheckBox.isChecked();

        // Figure out if the user chose "Ipod" answer
        CheckBox IpodCheckBox = findViewById(R.id.ipod_checkbox);
        boolean hasIpod = IpodCheckBox.isChecked();

        // Figure out if the user chose "Ipod" answer
        CheckBox ImaxCheckBox = findViewById(R.id.imax_checkbox);
        ImaxCheckBox.isChecked();


        if (hasIpad) {
            if (hasImac){
                if (hasIpod){
                    increment_score();
                }
            }
        }
    }

/**
     * This method is called when user selected the correct answer.
     * Added +1 to score for each correct answer
     */
    private int increment_score() {
        score = ++score;
        return score;
    }

}][1]