Hi,
There are certain conditions and requirements that need to be fulfilled by the candidates in order to be considered for admission. The eligibility criteria for admission varies with institute.
Qualification - Should have passed class 10th or 12th.
Minimum marks - Candidates should have obtained 40% marks in the qualifying examination. (Note: Minimum marks can vary from institute to institute)
Compulsory subjects - Generally Mathematics, Science & English are considered to be compulsory subjects to apply for diploma courses.
For more information about admission and exams. Click on the link mentioned below
https://engineering.careers360.com/articles/polytechnic