Birth or Age, Evidence of - Australia Visa

Birth certificate in English 189 / 190 visa - Date of Birth

Provide a certified copy of your full birth certificate as an evidence of date of birth.

No Birth Certificate issued by your country?

If your country of birth does not issue birth certificates, provide written notification stating this, and provide your country’s equivalent documentation, such as secondary school certificate, family book extracts or family census register.​

In case of India, they do issue Birth certificate usually via local municipal corporations.
So, you should not use your Xth (or secondary school certificate).

or if you want to use your Xth certificate as proof of birth, you have to get a letter from municipal corporation stating that they do not issue birth certificates.

Birth Certificate not in English

If your birth certificate is NOT in English, then you need to provide an English translation of Birth Certificate.