IIT

To get admission in NITs and IITs, you need a strategy. You need to make your basics clear and rigid so that you can move forward. You can read NCERT books. You should practice as it will help you to understand the theories in a better way and also you will come across some unknown methods to solve a particular problem.
You can collect the previous year question papers with their solutions as it will help you to analyse the pattern. You should revise the areas in which you are strong, but work on the areas in which you are weak.
Best of luck.

BITS-Pilani, VIT University, Manipal University, Thapar University, SRM, BIT are recommended options. You may refer to following link for ranking of top engineering colleges in India: https://www.shiksha.com/top-engineering-colleges-in-india-rankingpage-44-2-0-0-0

There are some coaching that offer free IIT preparation by conducting some exam for their coaching institutes. By giving those exams, you can get admission in those institute that will lead you to free coaching.
Examples are: Super 30, Anand Kumar Institute, etc.

It is a newly started program in IIT and it will take some time to get momentum. However, considering reputation of IIT, you may expect average package of Rs.5 LPA.

You need to qualify JEE Mains exam to get admission in NITs and JEE Advanced exam to get admission in IITs.
Kindly visit the link mentioned below to know about the colleges offering B.Tech in biotechnology:
https://www.shiksha.com/top-bio-technology-colleges-in-india-rankingpage-54-2-0-0-0

Hello Vaishnavi,
IITs, followed by NITs and IIITs are definitely the top colleges for B.Tech (engineering). These colleges are cost-effective as well. However, getting through to these colleges isn't easy. Further, they provide limited seats.
Due to this, many students who couldn't get through to IITs/ NITs opt for private colleges. If you're interested in private colleges, there are hundreds of private colleges in India which provide quality education and placements.
I hope this helps.

My recommendation on your choices is as follows in order of precedence: IIT, NIT, VIT. These are based on brand image, career opportunities, growth and other factors.

Hi Hasnain,
Getting the free seat actually happens, when the person crosses the cut-off mark and should score few more marks more than the cut-off mark. As per you, if you feel that you have score minimum of 25% marks more than cut-off mark in JEE exam, then you have a chance to get a free seat. But, it may be the top-most IIT college, but in any IIT or NIT you can get.
All the best.

Hi,
It entirely depends on the cut off of that particular year. But getting 230+ would ensure your admission in CS in good NITs. In case of IITs you need to just qualify JEE Mains but have to do well in JEE Advanced.