Engineering

Yes, it is correct that DCE (now DTU) used to give University of Delhi's B.Tech degree, but now it is a state university. Same is the case with Netaji Subhash Institute of Technology. So, those colleges will also give you B.Sc Degree. But, there is a center in University of Delhi that is providing B

Strick is better. But, if you have knowledge about your field, then you can apply this degree anytime and anywhere.

Both of the courses are equally important at their places. CSE is hardware oriented. IT is software oriented. A CS engineer can both be a hardware and software engineer. An IT engineer won't be preferred over a CS engineer for hardware oriented jobs. Both have good career opportunities.

This year the first batch will be passing out. More than 1000 students take admission every year in engineering.

There are several number of NIT colleges near Kolkata. Some of them are:
Narula institute of technology
Indian Institute of engineering Science and Technology
Government College Of Engineering and Leather Technology
Calcutta institute of Engineering and Technology

As you already known that the best college of UPTU is HBTU, but is no more part of this organization. So, for CSE, you can try IET-Lucknow, but I will say your college does not depend but your branch depend upon placement, and CSE is extremely good branch in whatever college you got.

Chemical engineering is one of the best field of education in engineering sector. Chemical engineering has very good future in the upcoming days. The companies like HAL, ISRO BHEL, BPCL, etc. will take chemical engineering graduates each and every year. So keep going.

I think you have given JEE Mains so you can get admission only on the basis of merit rank.

If you are focusing only on engineering then I would recommend you to go for polytechnic first. The reason behind going for polytechnic is that you will be exempted from the entrance exam. Even you will not have to pay heavy fees for tuition. The second plus point is that you will be much more techn