Despite what many Witnesses may say yes they are banning higher education. Even if it does not specifically say it in the literature its heavily implied and then heavily reinforced with the Circuit Overseer comes around.
Social pressure from other members is the true cornerstone of this religion. If something is frowned upon but not necessarily scripturally banned then fear of being out of the social group and being outcast causes people to go along with the crowd. Higher education falls sort of into that category.
"Sure go ahead and let your kid go but don't expect any praise from prominent elders, CO, etc. and don't expect to be in the popular group"
Really stupid!