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Since my first year at university, I’ve been the representative student of the Department of Metallurgy and Materials Engineering and the vice chairman of Metallurgy Student Club. So, I’ve got the responsibility of the communication among students and teachers and school management about academic, social and technical matters. By this way, my skills of problem solving, multi-dimensional decision-making and organizing activities and teamwork have improved on a gradual basis.
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i edited it n changed this to

Since my first year at university, I’ve been working as the representative student of the Department of Metallurgy and Materials Engineering and the vice chairman of Metallurgy Student Club.

I took the responsibility of coordination and communication between students and administration of faculty in academic, social and technical issues. Thus, I improved problem solving, multi dimensional decision-making, teamwork and organizational abilities.
by the way

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