MBBS

Yes you are eligible for JIPMER MBBS once you qualify your 12th. All the best.

You can opt for BAMS, BHMS if there are isssues related to finance. Or you may choose Bsc.

MBBS is the study of modern medicine, disease processes. Obstetrics and Gynaecology are the subjects to be taught in MBBS. Nursing is about assisting Medical Personnel in their duties.

NRI students are allowed for attending counselling under 15% All India Quota. However they have to go through the State Round of counselling for other universities. Admission for NRI seats varies depending on state.

Private Universities do get 5-15% seats for NRI admissions. That is different from 15% All India Quota Counselling. NRI quota admission are done at college level.

A NEET score of 70% is required to get into a government medical college in India. Below that you MAT get private colleges.

Yes. Pre registration is required for admission into medical colleges. After publication of NEET result you have to register for All India and State round of counselling.

As per the directives of Hon'ble Delhi High Court, NIOS students are allowed for NEET examinations. Read here
https://www.ndtv.com/education/nios-open-school-students-can-apply-for-cbse-neet-2018-technical-glitches-persist-1819396.

There's no such clear cut cutoff score for management quota admissions for MBBS. That depend on Universities.

Creamy layer student do not get the reservation weightage as availed by non-creamy students. Hence they are treated as General Category students.