Colleges in Vellore

VIT University placement record is better in comparison to Nirma University for engineering graduates.

Yes, you are eligible.

Getting admission is itself a tough one but attend the counselling. Even if you don't get VIT Vellore, you can get Bhopal and Amaravathi campuses. VIT-Chennai is also doubtful as 1-100000 ranks are called for counselling, you may get any campus in the phase 2 counselling but with a higher fee structure.
All the best.

You may get. Chances are low but if there are some drop outs in the first 10000 ranks, then you might get.
Attend the counselling and try your luck.
All the best.

Yes, please attend the counselling as you can get any course other than what you expect to get. Your fee may be a little higher as first 20000 candidates are offered the admission, first you will be called for phase 2 counselling.
Try your luck.

VIT University is a better option in comparison to your other choice if you are getting a similar branch in both colleges. You may opt for an institution where you get subject/ branch of your choice.

Vellore campus is very expensive.
Every one want admission in Vellore campus.
Vellore is first choice of students.
But, in second campus you didn't get luxury facility like Vellore .
So, students are not interested in second campus.
But, in education level both are good.
But, facility is weak point.

Yes, VIT offers B.Tech in mechatronics.

Yes, you should wait for the result. By the way, you got decent rank in VIT. You will get CSE with this rank in VIT University.

The better one is VIT-Vellore because it is widely preferred by the students for B.Tech and CSE. SRM is also good but if you get VIT go for it.
Both are good but the fee structure is a little high as they are private universities.
Salary packages depend on the candidate's skills and also the companies that offer core jobs. The candidates should have some additional skills to get placed easily.