Abstract: Disclosed is an on-line education method using an Internet. The on-line education method includes (a) a basic learning step for providing a learner with a concept lecture video for a predetermined learning category, (b) a feedback learning step for providing a predetermined number of questions to the learner together with at least one of correct solutions, explanations, solution videos and concept videos to allow the learner to review a content of the concept lecture video provided in step (a), (c) an instant test step for providing questions selected by the learner according to a degree of difficulty and a number of questions together with a correct solution, explanation, a solution video and a concept video for each question, and an instant test feedback sham examination step for providing questions, which are similar to the questions that the learner fails to answer in step (c).