This research was prompted by a reflection on the level of preparation and the way in which the course of Principles of Economic Theory is taught at the last grade of secondary education in Greece. Under the Greek system of access to tertiary education, this course determines, to a large extent, admission to university departments of economics. The research was conducted with students in a department of economics by investigating the degree of satisfaction from their high school preparation in relation to their decision to attend private supplementary teaching for the national admission exams to tertiary education. Additionally, there was an investigation into the choices of the educators as to the way in which the course in question was taught.