In this paper, the author reports on an attempt to clarify the relationships between student personality characteristics and success in passing the A Class Information Processing Qualification Test (sponsored by the Society for the Promotion of Special School Education). The results from a suitability test as well as from the proficiency test were analyzed by principal factor analysis and the resulting factor score was subjected to an analysis of variance in order to extract such characteristics of the successful group as might not have been recognized from the proficiency test alone. The results showed that those who passed the proficiency test, in comparison to those who did not, shared a tendency towards more logical and theoretical ways of thinking.