Diploma

No, once you get admission then you can't change your branch in the second year, but if you have done your class 12th then you apply for lateral entry programme.

Mode of Exam: Pen and Paper Based Test
Duration of Exam: 3 hours
No.of Questions: 170 Multiple Choice Questions
Negative Marking: There will be a negative marking
Section: 1
English Comprehension
Section: 2
Quantitative Aptitude and Numeric Ability
Section: 3
Data Analysis and Sufficiency
Section: 4
Reasoning

Of course, going for polytechnic is good if you want to be technically strong than those who are joining engineering after 12th. After joining Polytechnic, you will be technically sound already as compared to freshers coming from 12th. While those who are coming by doing 12th they will lack knowledg

You have secured a good rank, you can get admission in a government college.

After pursuing your Diploma. You can take admission directly in the 2nd year through lateral entry schemes.

The fee structure will be around 38K per year.

It depends on your location and your choices.

I think you should choose NCVT 3 years motor mechanic course from Tata Nagar because it's a pro-courses and you'll learn a lot with NCVT.

The fee is around 20K for government college and 45K for private college and fee may vary as per the college.