Educational services, namely, providing in-person and on-line classes, seminars, lectures, courses, test preparation exercises and test preparation classes, all at the primary, secondary, post-secondary and graduate levels; producing continuing public service audio and video programs for distribution through podcasting and webcasting in the field of education; electronic publishing of on-line interactive exercises in the nature of educational workbooks; providing educational services in the nature of courses and online courses in the fields of curriculum development and online teaching and learning