Hello Suraj,

There are at least two to three chances to there to give your 12 boards again even you fail in the first time.

1. Compartment.

In this exam, you give paper only to those subject in which you fail. If you fail in 2 subjects then you have chances to give compartment exams.

2. Improvement.

In these exams, if you pass in all exams and you are satisfied with your result then you can give second-time same exam but in next year.

Fill the form, select the paper that you think needs improvement and increase your marks.

And some other way is re-evaluation or rechecking.

Hope this helps.