Hey Shivansham.

As you have not mentioned which board you are from, I will give you the percentage required of some major boards. The percentage required for passing are:

ISC- 35%

CBSE- 33% separately in theory and in practical

WBCHSE- 30% separately in theory and practical (if any)

GSEB- 33%

Kerala Board- 30% marks in each subject for the Secondary School Leaving Certificate (SSLC) exams. If they secure 30 to 39% in the SSLC papers then, they are eligible to appear for the Save-A-Year (SAY) exams. 30% in continuous evaluation (CE), practical evaluation (PE) and terminal evaluation (TE).

TN Board- 70 out of 200 

KSEEB- 35%

Odisha- 30%

Hope this helps. Please respond in the comments as to which other board you wanted to know about. 

All the best.