In cases where the learning effect of preparatory education is measured by pre-test, e-testing is considered to be effective because these tests are conducted at remote places. We conducted preparatory education that combined distance education and a pre-test. On the basis of the results, the meaning of the pre-test is analyzed in this paper. First, we discuss the reliability and the validity of the testing method. Second, we clarify the differences in characteristics of the students who took the pre-test. Third, we prove that the pre-test can accommodate students with a variety of academic achievement levels. Finally, we show how the data obtained from the pre-test can help improve education in various aspects.