Scholarships / Teaching assitantships are available for deserved candidates for M.DES programs in IITs and IISC. Students can also earn scholarships through sponsored projects offered by the companies.

I guess you are asking about foriegn nationals ??

no there is no negative marks for nata you can check it here

https://cdn4.tcsion.com/dotcom/ICMP/Guidelines/NATA/NATA2018-Brochure.pdf

 At least 80/200 (40%), for consideration of admission into first year B.Arch programme.

Portfolio is not required for NIFT admission.

Yes. the syllabus is the same for both the exams.

NID offer sponsored projects for their students. if your project is sponsored, then you would be paid anywhere between 5k to 20k per month depending on the sponsors budget.