India

Yes. There are many universities as in Delhi University and IP university, so with 70%, that will be enough for you. The cutoff of Delhi University will be releasing in June, so you may wait for it.

That depends on your course that you will opt. As in different college have different cut off. But you can go for entrance exam for other universities. http://www.du.ac.in/du/index.php?page=cut-off-2017
You can have idea of cut off in the above link (Delhi University 2017 cut off).
best of luck.

Hello,
I hope you are doing well. State rank will be calculated by your state counselling authority of JEE Mains based on that you will be able to go for NIT. You will definitely get a seat in NIT Karnataka along with your favourite branch.
All The Best.

Top MBA Colleges in India Accepting PGCET are mentioned at the link provided below:
This ranking is based on rankings published by The Week, Business Today and National Institutional Ranking Framework (MHRD). https://www.shiksha.com/mba/ranking/top-mba-colleges-in-india-accepting-pgcet/2-2-0-0-9262.

Hi Subhashish,
Yes, of course. If you have secured a minimum of 50% score in 10+2, you can definitely get a good college.

Check the list of all B.Tech colleges/institutes in Chhattisgarh listed on Shiksha. Get all information related to admissions, fees, courses, placements, reviews & more on B.Tech colleges in Chhattisgarh to help you decide which college you should be targeting for B.Tech admissions in Chhattisgarh at the link provided below:
https://www.shiksha.com/b-tech/colleges/b-tech-colleges-accepting-cgpet-Chhattisgarh.