Engineering

The fee structure for Polytechnic course is around INR 30,000 per year.

There is no chance in Mechanical engg in IET and BIET.

Depends on your rank in JEE Mains. Check this link for cut-offs in NIT-K (Surathkal):
https://www.shiksha.com/college/national-institute-of-technology-surathkal-mangalore-24187/admission#admission

If you want to drop, then you have to make a strong decision and work to prepare for both RBSE 12th exam and JEE Mains. If you are dropping, then make it useful rather than wasting your time.

I am not know about chemical in VNIT very well but in SVNIT chemical is good. Now a days chemical branch is on progress in SVNIT.

CET rank doesn't matter for NIT-K admission. Only JEE Mains rank matters.
Check the below link for cut-offs:
https://www.shiksha.com/college/national-institute-of-technology-surathkal-mangalore-24187/admission#admission

National Institute of Technology (NIT) takes admission through AIEEE exam. If you want to get admission in NIT, then you need to
appear in AIEEE exam which is conducted by CBSE every year. To appear in AIEEE exam, you should pass the 12th standard. With Physics, chemistry and mathematics with at leas

It depends upon which branch you have to choose. In SVNIT, Computer and Mechanical are the best.

NIT surathkal is best for Mechanical Engineering.

In SVNIT, computer engineering and mechanical engineering are good. If you have taken ECE and have good coding skills, then you can get the best placement. For ECE branch, very few companies visit the campus. Very few chances to get a job in companies like Google.