Hello; I would like to help with your question today.
Have you tried Greatschools.org? You can use this site to compare k-12 private and public schools:http://www.greatschools.org/
www.schooldigger.com might also help in your search to compare private schools.
Also, look at http://www.privateschoolreview.com You can search for schools based on your location and criteria. It also gives tips on evaluating private schools.