If nobody is grading you (a professor, a tutor, a supervisor, a boss, a customer), how do you know if you education is correct? Your education is correct when

If nobody is grading you (a professor, a tutor, a supervisor, a boss, a customer), how do you know if you education is correct? Your education is correct when you are sure about your education. If you do an exercise, and you are not sure you did it right, then it means you need to practice more. Having the answer to the exercises is useful to accelerate your learning, but you don't need anyone to tell when you are prepared.