This study tries to identify the possible differences in the types of strategies and their frequency of use in low and high achievers of English in a language centre in a university in Tijuana, Baja California, Mexico. Data were collected using a mixed-methods research methodology. The sample consists of 27 students with a high score and 30 with a low score on the achievement test. The results show that students in both categories use similar strategies; the difference lies in the frequency of use and how they use the strategies. Finally, from the qualitative data emerges a list of strategies used by high achievers.