Stanley Kaplan, who launched what became the nation’s largest test-prep business, helping students get ready for college-entrance exams such as the SAT, has died at age 90, Dow Jones Newswires reported.

Kaplan Inc., which blazed a trail for the for-profit education industry, was sold the Washington Post Co. (WPO) in 1984. At the time, annual revenue was about $35 million.

Filed under: K-12 Education News