To pursue a Diploma degree at Kottai Mariyamman Polytechnic College Salem, candidates must meet certain eligibility criteria. Firstly, applicants should have successfully completed their secondary education (10th grade) from a recognized board or institution. Additionally, they must have studied Science and Mathematics as compulsory subjects in their 10th grade curriculum. Furthermore, candidates are required to secure a minimum aggregate score of 50% in their 10th grade examinations. It is important to note that meeting the eligibility criteria does not guarantee admission, as the college may have limited seats and may also consider additional factors such as entrance exams or interviews during the selection process.