CBSE 12th

You didn't fail. It was just a matter of few questions and speed which made others to score more than you and you can achieve the same by practice and hard work. And if you are talking about SGSITS then it depends on your rank, category, branch you wanna opt, etc. I will personally suggest that avoid taking admission in BM. Rest depends on your interest. For general category male, normally, the closing rank is around 40,000, still if you want admission then you can try your luck in the college level counselling.

Biotechnology courses would be the best for you.

You can do BCA, BBA, normal or even B.Tech from a private college because the dates for JEE Mains have passed.

What do you want to do?
Field of interests?

You can do BCA, BBA, normal graduation or even B.Tech from private colleges.

Was maths your extra subject?

Hello Arvind,
These days, almost all engineering colleges, be it Govt or private, give admissions only after the entrance exam. This is fundamental to avoid a charge of nepotism. Hence I doubt if you can get admission without entrance.

Some of the best engineering colleges include Medicaps and LNCT.