It depends on what your state requires of how many you do. You do not have to do these subjects like the public schools and it's up to the parents of how you grade. Just mostly keep up with hours. For each credit you wish to recieve, you will need 150 hours of work, or 4 hours and 10 minutes a week. Think in terms of an average of 5 hours for each class. Like I said before, it depends on student and parent of how you choose to do this. I hope this helps my Dj friends!