You need to introduce the student with examiners manual where it says exactly what kind of qualities are sought after in trainee in order to pass the skill test. Explain him that he's not allowed to use iPad or autopilot in the skills test therefore if he ever wishes to pass it, he needs to learn how to fly without these. If he refuses to accept this, send him home. Don't do business with stubborn people, they will only lead you in trouble, if this guy screws up in his solo, you're going to be held responsible. Do you really need it?