5. St. Stephen’s Episcopal School
St. Stephen’s Episcopal School is an elite, one of the best private high schools, boarding, Christian school located in Austin, TX. It has 688 students in grades 6-12 with a student-teacher ratio of 6 to 1. Tuition is $49,390 for the highest grade offered. After graduation, 100% of students from this school go on to attend a 4-year college.