Hello Rahul, no, you cannot do diploma in metallurgy from Shri N.M. Gopani Polytechnic Institute Ahmedabad by giving the external exam. The institute does not offer external exams for diploma courses. The only way to get a diploma in metallurgy from Shri N.M. Gopani Polytechnic Institute Ahmedabad is to enroll in the full-time diploma programme. The programme is offered in two years and is divided into four semesters with the fees being Rs 31,000 per annum.