The positive washback found in both the IELTS and the iBT courses was the promotion and development of skills through test related activities, asking students for participation and interaction while doing test tasks; however these activities were more evident in the IELTS courses. Among other positive washback effects seen in this study was working on integrated skills in iBT courses. On the other hand, working on communicative activities and assigning students to pairs and groups to perform the test activities were exclusively found in IELTS courses.