India

Techno India should be at no. 1 for priority to get admission here. This is best ever college for BBA and MBA studies. Overall Its placements is also good.

Try Shiksha's rank predictor and check the college rating according to it:
https://www.shiksha.com/b-tech/resources/kcet-college-predictor

Top colleges in terms of placement are:
1. Osmania University
2. JNTUH College of Engineering
3. IIIT-Hyderabad
4. BITS-Pilani
5. VNR Vigyan Jyothi.

As you are general category student, you cannot get good NITs and good branches. But you may get a lower NIT and branch.

College change or university change after first year is completely dependent on the college and university norms, some universities allow it and some won't. Plus, you need to have good scores in the first year to apply for the same. For further details, contact the college authorities.

Some of the MBA colleges in Delhi ncr are:
Indian Institute of Foreign Trade IIFT Delhi. Faculty of Management Studies (FMS), Delhi. Delhi School of Economics (DSE), Delhi. International Management Institute (IMI), Delhi. Indian Institute of Technology IIT Delhi. Delhi Technological University (DTU), Delhi.

Hi!
You can find the top colleges for MBA in Tamil Nadu by clicking this link https://www.shiksha.com/mba/ranking/top-mba-colleges-in-tamil-nadu/2-2-123-0-0.

PDPU Gujarat is a better option for B.Tech.