Engineering

For getting admission in this college you have to appear for the JEE Mains paper 2, after that you can easily get admission in this college if your score is good.

Hello,
Greetings from Shiksha.
Check out the college predictor of Shiksha:
https://www.shiksha.com/b-tech/resources/jee-mains-college-predictor
You will find your college through this.

Yes, you can do a Diploma in Mechatronics, as it is a very good course. Diploma in Mechatronics Engineering is a 3 years long Diploma certificate program. This course can be pursued by students who have passed the 10th standard as well as class 12th.
All the very best.

First of all, have some kind of basic knowledge about the mechanical subjects, which would be coming on your mechatronics.

Hello,E&TC is better than electronics because it is a combination of two fields. One is electronics and the other is telecommunications. So, you have a chance to get a job in both industries, which is a plus point compared to electronics engineering.

No, an engineering degree is required to become a programmer. It requires specialised knowledge and aptitude in a programming language / platform.

It is good for CSE, but for mechanical it is limited.

Hello,
Get acclimatized to the mode in which exam is going to be conducted. Practice a lot. Must refer to the short notes for revision. Appear for full length NTA UGC NET Mock Test papers and check your efficiency. You will also get to know about the weak areas. Now let us talk about the difficulty level, for the real feel of exam, for the real difficulty level and to get to know how a simple question is made complex in the examination, just practice previous year question papers. One more thing while solving previous year test papers, rely on only official answer keys. Hope the above information helps.

Getting a job involves criteria like your personality, communication skills, subject knowledge, etc. So, try excelling in theses you will surely get a good job.

I think you need a better score in JEE to be eligible for NIT.