English in Tanzania is taught as one of the major subjects at Advanced Certificate of Secondary School Education (ACSE). This paper explores the strategies employed by teachers in implementing the ACSE curriculum. The curriculum requires that the subject be taught using the competence based approach where learner-centred strategies are emphasized. The study employed mixed methods and descriptive design. Purposive sampling was used to get schools and teachers because it was only schools that had English as a major subject in the municipality that were selected. The findings reveal that the teacher-centerd strategies dominate the curriculum implementation as opposed to learner-centerd ones as required by the curriculum. The paper therefore recommends that teachers in Iringa municipality be oriented on the learner-centred strategies in the implementation of English at ACSE. It is further recommended that since oral language skills form a large part of the curriculum, these skills be assessed at both school and national based assessments if they are to be taught and learnt. This is because no teacher can waste time teaching what is not assessed and no student can take trouble to learn what is not assessed.