See for doing diploma in computer science course you need to know the eligibility criteria like:
You must have passed 10th grade (SSC) from a recognized board.
Usually, a minimum of 50% aggregate is required, but this varies by institute.
After this the admission process follows:
->Direct Admission : Many polytechnic colleges offer admission based on your 10th-grade merit.
->Entrance Exams : Some states conduct entrance tests like TS POLYCET , AP POLYCET , or DCET .
Hope you got the clarity.