Teacher face a number of challenges in learning how to teach Tamil grammar punarchi vedhi effectively. A number of studies were conducted later on a variety of learning and instructional strategies and it was found that certain strategies significantly improve achievement. To co-operate is to work with another or others. In practice, cooperative learning has come to mean students working in pairs or small group to achieve shared learning goals. The term cooperative learning refers to learning activities especially designed and carried out through pairs or small interactive groups. Some of the techniques are Think-Pair-Share, Round Robin, Buzz Groups, Talking chips, Three step Interview, Learning Cell, Fish Bowl, Role Play, Jigsaw, Think-Aloud pair problem solving, Send-a-problem, Structured problem solving, Analytic Terms, Affinity Grouping and Term Matrix. There is no significance difference between the pre-test and post-test means scores of the achievement in Tamil grammar punarchi vedhi of the experimental group. The sample consists of 8^th standard students are studying in Government High School Narasingapuram, Salem district. A total number of 40, 8^th standard students’ constitute the experimental group for the present sample of the study. The effectiveness of cooperative learning strategies technique on achievement in Tamil grammar punarchi vedhi was very high. There is no significant difference between the post-test mean scores of the achievement in Tamil grammar punarchi vedhi of the experiments group with respect to gender, study habit, parents’ educational qualification and parents’ occupation. The present study has investigated the hard parts in Tamil grammar punarchi vedhi and the construction of cooperative learning strategies techniques at secondary level and it found that the effectiveness and utilization were very high in the case of achievement in Tamil grammar punarchi vedhi. Since, cooperative-learning strategies is having effectiveness on achievement in Tamil grammar punarchi vedhi.