As with any number of religions that down play education, the Amish comes to mind, the gone but not forgotten Shakers, actually too many to name......the Jehovah's Witnesses now have the distinction of being the least higher educated major religion according to the Pew religious Survey.
Even the Mormons understood that education makes a difference as they have four or five universities as well as a number of colleges.
Even the land and mind blocked Catholic church recognizes the need for higher education......though not necessarily for the lower class.
The early Russellites were all born in the `19th century' where, on average, an eight grade education was as good as it got.
These 19th century believers taught the next generation all that they needed to know. People like Franz (who did have two extra years in college) Knorr and just about every one of the Bethel 'heavies' had eight grade educations. Or when the law was changed High School education if they didn't dropout to pioneer.
But times change and I can say with confidence.........The WTBTS has caught up to the 20th Century and are now comfortably mimicking the 1950's, they by-pass the 1960's as they were too preoccupied with banning long hair, Rock and Roll and grass. The 1970's they totally try to ignore as it was a total embarrassment.
They emerged in the 1980's with their 1950's thought process intact and carried on becoming, over the next decades, the least educated major religion with the lowest financial earnings of any first world country.
Their biggest problem is the same problem many forgotten religions faced......they teach their followers how to live in a world that doesn't exist.