About two years ago, a group of medical students at Ege University Faculty of Medicine in Turkey began meeting to study single variable calculus. None of the students had taken a course in this subject before. But with the guidance of lectures, slides, and other freely available resources on MIT OpenCourseWare (OCW), they soon advanced onto multivariable calculus. Then differential equations. Then linear algebra. Today, the students, who call their study group İleri Çalışmalar, or “Advanced Studies,” are paving their own road toward doctoral-level studies — with MIT OCW as…