India

Hi,
It depends on your 10+2 marks also, you may check the link below to get a list of approved architectural colleges.
https://www.coa.gov.in/index1.php?lang=1&level=0&linkid=25&lid=26

Well This is good course you can go for. This is also developing industry in modern time. There will be huge amount of Polymer chemistry graduate in the industries in future too. In modern time, There is a huge scope of this course.

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.