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If you have completed a 3-year diploma but need to fill a form for 12th-level education, you will require an equivalent certificate.
To get this certificate, you should apply to the State Board of Technical Education or the relevant education authority. You will need to submit your diploma certificate and mark sheets as proof of your education.
Fill the application form for the equivalency certificate carefully and attach the required documents.
There may be a fee for processing the certificate, so check the official website or office. Once approved, you will receive an equivalency certificate recognized as equivalent to the 12th standard.