How to make this nested class work?

[FallArk]

So, I was asked to make a program that will calculate my own grade, and it is required to use subclasses inside a class.
main is posted below and cannot be changed:

int main() {
Grade gradeMe;
gradeMe.getExercises();
gradeMe.getClickers();
gradeMe.getLabs();
gradeMe.getTraces();
gradeMe.getAssignments();
gradeMe.getTests();
gradeMe.getPrefinal();
gradeMe.getFinal();
gradeMe.displayTotals();
}

what I have done:

class Grade {
public:
    class Textbook{
public:
    int textbookPts;
    int i = 1;
    int bookPts() {
        cout << "Enter textbook exercise #" << i << " (out of 10 points): ";
        cin >> textbookPts;
        ++i;
        return textbookPts;
    }
    };
    Textbook Text[10];
    int getExercises() {
        for (int x = 0; x < 10; ++x){
            Text[x].bookPts();
            textbookSum += Text[x].bookPts();
            if (Text[x].bookPts() == -1)
                break;
            textbookTotal = x * 10;
        }
        cout << textbookSum << " out of " << textbookTotal << " points for textbook grade" << endl;
        return textbookSum;
    }
private:
    int textbookSum = 1;
    int textbookTotal = 0;
};

My idea is to find the general case of this program, then use it as a template to fill the others. I was thinking that create a class that will ask the user(myself in this case) to input the grade, and then declare this subclass in class Grade, the getexercises function then have a for loop to keep asking for input until the user input -1. But as of now, the loop will not exit when -1 is entered, and it keeps going #1... #2... #3... #1... etc, instead of going 1...2...3...4...5...6...
Help!

 

[FallArk]

I also was trying to set the sum of what the user get on the textbook exercises equal to the sum of the inputs, and the total of textbook exercises points equal to how many time the loop executed times the points of one exercises. The program is not really doing what I think it would, I must have messed up somewhere.