I think exercising at home has more disadvantages that adventages.
First of all I want to say about advantages. Students have more free time on their hobbies and interests. They can and learn and do everything what they want. Maybe eating, watching movies l, listening to music and more activities.
But the second in home teacher can't control students, they don't have certain contact with teacher. They can write off in Internet.
So, I think students just have to study at school.