1. Does it get the results you want?
2. Does what the school teaches jibe with your requirements?
3. Will your child be happy there?
4. Is the school financially stable?
5. How will you pay for it?
There is a bit more to the process, of course, but asking these five questions will get you started on the extensive due diligence which you must do before you spend approximately $150,000 for four years of private day school or approximately $200,000 for four years of boarding school. Tuitions vary. Some are much less. Some a great deal more. We are
discussing high school and middle school too. The primary grades will run you $8,000 - $15,000 depending on the school.
Remember: private schools in the United States are not subsidized by government funding. So they will charge whatever the market forces and their budgets determine can and needs to be charged. Having said that, be aware that most private schools offer financial aid programs, some of which will pay for everything provided you are able to meet their family income thresholds. Always ask about financial aid.
Scoping out private schools is very much like buying a house or renting an apartment. There are many emotional factors which most certainly influence your final choice of a home.