Computer Science and Engineering

Yes, you can get Mechanical or Electrical. But CSE is quite difficult to get with this rank and score.

You may get a scholarship. It's up to the university and your overall application package. You should also apply early, as soon as the universities announce the admission rounds, you should apply and not wait till the deadline.

to get admission in any of the IIT you need to clear some exams like IIT JEE for the long term programs and GATE for the Post graduation. There may be some certificate programs available but for that eligibility based on program to program.

As per my experience, I've seen the CSE department of JGEC is very strong. They take classes regularly and the teachers are good enough. In fact, I've seen them helping students a lot with their academics as well as career.
I've heard little of CSE department of KGEC.
If you consider the distance of

Go through the link below for details:
https://www.shiksha.com/b-tech/ranking/top-engineering-colleges-in-Pune/44-2-0-174-0

Hi,
Listing down few reputed institutes in USA providing Masters in CS. These universities are ranked based on eligibility, fee structure, mode of education, entrance exams and scholarships. These are the best place to for an CS Student to pursue his higher studies abroad.
Cornell University. Princet

Easily! You have got a rank good enough to get into even better colleges as well.
Good luck!

It should be under 500 to get admission in IET.

CSE is a better choice for sure. Check out the reviews below for more details:
https://www.shiksha.com/college/kalyani-government-engineering-college-38147/reviews?course=192192&sort_by=year of gradution&type=question

GGSIPU 2018 College Predictor
Use your GGSIPU 2018 rank to see where you can get admission at the link provided below:
See the courses, colleges & rounds you may crack
The result is based on admissions data of GGSIPU 2017
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https://www.shiksha.com/b-tech/reso