Two of my children are thriving in our local public school, but I believe the needs of my eldest could best be met in another environment. Should I feel guilty if I don't send all my children to private school?
Consider the individual needs of each child. Some parents educate one child in a private school, while a sibling attends public school. Don't feel guilty, each of your children learn differently. Do what's best for them individually.
Have a quick read on "When should I send my child to private school?".
What level of accountability to the students do the teachers have to meet curriculum goals? Is progress to these goals regularly communicated to the parents? By what means? Are there any opportunities to tailor the school day to allow for more physical activity/sports during the day?