Engineering Entrance Exam

Try Shiksha College predictor which gives an approximate idea of rank and colleges. You can specify the category you belong to in the predictor to know about your rank or colleges you want to shortlist.
All the best.

No, JEE Mains is all about how you have understood the topic and how you solve numericals within a short span of time. JEE is not an interview it's just an exam of your 11th and 12th subjects. Be thorough with all the topics and you will be good to go. Practice numerical as much as you can. Coming to your question the answer is no.
All the best.

If you are confident enough that you can study for one year without any diversion. Then yes you can. I am a dropper and I was self motivated to crack JEE with a very good score. And yes I did it. Everyone is capable of doing it, just don't lose hope and work hard for a year. The amount of effort should be much more than you put in 12th.
All the best.

That totally depends on the pattern and difficulty of the paper and also the number of students applying for JEE. Percentile is calculated wrt to the number of students getting marks below the respective person whom percentile is being calculated. If the students will vary they percentile may also vary. I hope you understood.

I don't know about Satyabhama if giving scholarship on the basis of JEE. They provide admission by giving their entrance exam that is SAEEE. The application process is still going on. If you want admission in that college you can fill the form and score very good rank. Where you will have a fair chances of getting scholarship. Also, the top three in semesters is awarded a scholarship which is named as Remibai Jeppiar Scholarship

You can take admission in VJTI only through MH-CET and the last year's cutoff is 117 for textile engineering and 171 for computer engineering. You can check this link for more information:
https://www.shiksha.com/college/vjit-mumbai-veermata-jijabai-technological-institute-matunga-east-19301/admission#admission
For IITs you have to get a good rank atleast in top 5000 in JEE Advance in order to get a good college.

If you have scored more than 75% in your 12th then only you are eligible to get admission there.
Your JEE score is good, you should try for highly preferred branches.
For your convenience, I am attaching a link here which will give you more information regarding VNIT:
https://www.shiksha.com/college/vnit-nagpur-visvesvaraya-national-institute-of-technology-24399/admission

You can get admission there through JEE Mains or MHCET.
You have to score minimum 50% marks in your 12th to be eligible.
I am attaching a link which have all the information in detail.