I guess you are asking about foriegn nationals ??

Foreign citizens—applicants holding citizenship of a country other than the Republic of India—are eligible to apply only under the overseas (supernumerary) category, provided they fulfill all the eligibility criteria

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.

Yes. you get discount. please talk to their councellor at 9591001000.