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The purpose of this study is to evaluate both the usefulness (practicalness) of portfolio study in English preparatory classes and the retention of learning by considering extra-class activities while preparing portfolio. Fifty students and two teachers took part in this study. Special state method was used in this study. During the application, control group students continued their lessons with traditional teaching methods. At the end of the application, posttest was implemented to experimental and control group to test students' academic success. Approximately two months later the test which was applied to experimental and control group students as a posttest was applied again as a retention test. According to the results of the research, it seemed that experimental group which was applied portfolio was more successful than the control group in terms of academic success level, retention level and creativity.