India

For ranking you need to check Times of India Education as it would provide you the idea for top B-schools.

With AAAAA rating, Indian Institute of Technology (IIT), Kharagpur leads the pack of Top Engineering Colleges in West Bengal 2015, followed by AAAA+ rating for bothIndian Institute of Engineering Science and Technology, Shibpur; and Jadavpur University, Kolkata.
The next set of Top Engineering Colleges in West Bengal 2015 with AAAA rating includesIISER Kolkata, NIT Durgapur, West Bengal University of Technology, Kolkata and Bidhan Chandra Krishi Viswa Vidyalaya, Nadia.

In India most of the colleges including IITs have NRI quota. You may apply to this category and can easily get admission in any top college.

We cannot predict what will happen by 2023, but with some ideas I can suggest you to pursue B.Tech in ECE branch because in coming years there are many ECE based companies which will visit India and consequently there will be high demand of ECE graduates.

Yes, you can take admission in B.Sc agriculture in PU because they are admitting both medical and non-medical students. You can take admission in several universities by the same criteria.

Candidates are advised to check below all important dates and timelines for different events of KMAT 2017:
SL. No Events Respective Dates
1. Registration process would be started - July 2017
2. Registration process will be closed on - May 2017
3. Admit card can be downloaded from - May 2017
4. Examination date - May 2017
5. Declaration of result - June 2017