Science

There are lot of college of b.sc in channai.
You can visit below link for more information.
https://www.shiksha.com/resources/college-comparison

Yes, it is a good course with very nice professors and curriculum. But of course, you have to look into your interests as well. All courses in TISS are nice and taught by the experts from different fields, so you have to decide which course is best for you.

What was your branch in class12th?

Keep checking the official website for further announcements and dates, as it varies every year.

Looks like you are worried about choosing the right stream for you. First things first, try to imagine yourself doing a job. What kind of a job would it be? Do you love managing people or finding how a gadget works? Does playing with appliances attract you more than money related issues? Ask yourself such questions and you'll get your answers. Choose your subjects wisely and choose something that you enjoy.

Fergusson College (Pune), Christ University (Bangalore), Presidency University (Kolkata), Manipal University (Karnataka), Loyola College (Chennai), Mount Camel College (Bangalore), Madrass Christian College (Chennai), Jamia Milia Islamia (New Delhi) are a few great colleges for B.Sc (Biotechnology).

Sorry, but don't think you will get a government college, but you can try some other university examination.

No, it comes under School of Human Ecology and two MA courses are offered in that Centre:
(1) Master of Arts in Applied Psychology (Clinical Psychology)
(2) Master of Arts in Applied Psychology (Counseling Psychology)