CBSE 12th

First of all, clear your confusion. No government engineering college offer seat on behalf of your class 12th board percentage. You have to qualifying any entrance for government colleges.

I request you to not restrict yourself to biotechnology. I think you should take both bio and maths. But, clear bio/ maths with just passing marks. Most importantly maths when you are interested in biotechnology. You can also take biotechnology and maths in your school, if they offer biotechnology in class 11th.

You can definitely get admission, but the problem is Aeronautical engineering is a really tough subject. If you are determined to study it, then you can surely opt it. But, as you scored just 56% marks in your class 12th (PCM), I would suggest you to think twice before you go for it.

Its' really hard as you haven't taken IT nor maths as your subject. So the only way to become a software developer is to study on your own and search institutes who'll help you out in this. Trust me, if you choose to do this it's going to be really hard for you. So, in my opinion you should look out for any profession.

Hello Aditya,
First and foremost, you must start preparing for JEE Mains. Secondly CET of your state. But before all this you must study well and dilligently your subjects of 12th at present. Try to learn concepts.
Best wishes

Kindly do a B.Tech or B.Sc, your commerce graduation won't help you at all only if you are doing MBA in finance. All the best. It's too early to change your stream.

Hi Aatrey,
Yes, you can get admission with the above credentials in IMT, but you have to score above 90% marks to get the call from the college for GD/PI, and then your performance in it will decide your final admission. Also, the graduation marks of yours can be a hindrance in the placements as most of the companies ask for the above 60% marks in graduation.
All the best for your future endeavors.

Deepak, you can apply for lateral entry in Diploma Architecture. It will be of 2 years. You can inquire about the same from some universities like Lovely Professional University, Noida International University, etc.
But why to go for Diploma after 12th, better option would be to go for B.Arch. It will open wider career avenues for you.
Good luck.