Exam

No,
It's not possible for you to get admission in any of the NITs or IIITs or GFTIs. You have to go with low tier private colleges, use the college predictor tool to know in which colleges you can get admission.
https://www.shiksha.com/b-tech/resources/jee-mains-college-predictor.

Without any doubt, you can easily take admission in VJTI with your JEE SC rank.

No, this is not possible for a Diploma holder for NIT colleges through JEE Mains but you can directly take admission in IITs through LEET examination in the 2nd year of engineering. LEET examination specially conducted for those who want to take admission in IIT after Diploma.

Yes, through JEE Mains, you can easily get VJTI Mumbai with 83 percentile. Minimum marks required to be eligible for this college was around 130-140 in JEE Mains and you have already cleared that range of marks.

NIFT is a government college in designing field which offers admission only on clearing DAT prelims & Mains, situation test.
No donation is accepted here for admission.
If you are selected and have been offered the call letter from NIFT Bangalore, then only you can seek admission to it.
Fees for 4-years course, that is, for B.Des is Rs. 7.89 lacs.
For further details, follow the link below.
https://www.shiksha.com/college/national-institute-of-fashion-technology-bangalore-h-s-r-layout-27352

No,
With more than 9 lakhs it's not possible for you to get admission in that institute. You can apply for other colleges which you are eligible to apply, use the college predictor to know. https://www.shiksha.com/b-tech/resources/jee-mains-college-predictor.

You can go with college predictor tool to know in which college you can get admission. https://www.shiksha.com/b-tech/resources/jee-mains-college-predictor.

Here's a link to a free tool by Shiksha which can help you in getting answers regarding which college you can get. Please enter your details and get all the possible colleges you can get admission into. https://www.shiksha.com/b-tech/resources/jee-mains-college-predictor.