To investigate the influence of student modes of learning, or preferences for modes of learning, researchers at the Chulalongkorn University (Thailand) studied 97 Thai students who were beginners of English. It was hypothesized that: (1) aural and visual modes of listening and reading are related to achievement in English; (2) language aptitude, attitudes and motivation, non-verbal I.Q., study habits, and years of English are related to achievement in self-study programs; and (3) there are intra-relationships among the variables. The findings partially confirm the notion that language aptitude influences student modes of learning that in turn determines their English achievement and probably their English proficiency. Recommendations for teaching English as a foreign language in Thailand and for further research are offered. Details on the research instruments are appended. Contains 18 references. (LB)