Hi,

First of all I think you should remove all the fear of failing. If you will work hard and smartly you can pass the 12th exam. Just focus on your studies. Practice the model question paper of your board just creating the same environment as that of your board exams.

There are lots of examples of persons who were weak or failed early in exam but later qualified the even difficult exam. Just create your interest in studies and work hard. I think if you will be confiden and focus definitely you will succeed.

NIOS is a recognised open school so you can get admission to b.sc government colleges.

Hope this helps.