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The major aim of the study was to determine the roles of psychological and sociological factors in general and social/cultural capital and cognitive/metacognitive aspects in particular in English language learning. To this end, 143 English as a Foreign Language (EFL) learners were asked to take an IQ test, a metacognitive questionnaire along with a social and cultural capital scale. Structure Equation Modeling (SEM) was utilized to analyze the data. The results demonstrated that both psychological and sociological factors contribute to foreign language achievement, however social and cultural capital was found to be more influential in English language learning. In the end, the results were discussed in the context of English language learning and some suggestions were made.