An interesting comparison can be made with the Mennonites, who can be thought of as "Amish-lite". They have the same German Protestant work ethic, same rural background, and same large families. They do not reject the English language or culture to the same degree as the Amish. 
 
This link: 
 
http://www.iamenno.pvt.k12.ia.us/aboutims.htm  
 
is to the Iowa Mennonite School, which is located in rural Iowa. It serves the Mennonites (and others) in the surrounding area, who are primarily small businessmen and farmers, like the Amish, who also live in the area. 
 
As the link indicates, IMS grads rank quite high on standardized tests.  
 
Curiously, the higher education they encourage among their youth does not foster the culture-extinguishing mass abortion rates that seem to affect other Western women.

It was surreal, and I'm not sure I mean that in a good way. After the Persian rhinoceros charge failed, I kept waiting for Xerxes to dispatch his elite team of unicorn riders, but I left the theater disappointed.