Language learning correlates with higher academic achievement on standardized tests, higher achievement in college, and higher scores of verbal and nonverbal tests of intelligence. Students also show gains in comprehension and abilities in reading, writing, math, and other subjects. (Savelle-Troike 1984)  Additionally, students learning a foreign language have greater cognitive flexibility, better problem solving and higher order thinking skills (Hakuta 1986) as well as better listening skills and better memories than their monolingual peers. (Lapkin et al 1990, Ratte 1968)

There is also a correlation between second language learning and the knowledge of English structure and vocabulary (Curtain & Dahlberg, 2004). Learning a second language helps you to understand your native language structure better and increases the scope of your vocabulary!  In fact, students of foreign language consistently score higher on tests of English vocabulary, especially when the language being studied has Latin roots. (Masciantonio 1977)