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Yes you can get the best NITs or even IITs also after obtaining good rank in JEE Main and JEE Advanced exams. The basic eligibility criteria for admission in NITs and IITs is given below. Eligibility criteria :
1. 10+2 with minimum 75% of aggregate marks (For general category) with Physics, Mathematics and anyone from Chemistry/ Biology/ Biotechnology/ Technical Vocational Subjects. 65% (for SC/ST).
2. National Institute of Open Schooling conducted Senior Secondary School Examination with a minimum of five subjects. Further NIOS board does not offers the B.Tech courses, NIOS board is for open schooling (Secondary, Sr. Secondary etc. ). Only not for technical education.

Agri-business explores the production, marketing and trading of products related to agriculture. The MBA programme also covers improved growing techniques, agricultural machinery, fertilizer, pesticides pre- and post- harvest handling, storage, transportation, packaging and labeling. Critical management issues as financing and technical assistance, preparation of products for exports, overseas marketing issues and government policy are also an integral part of the programme. Some of the optional courses offered in an Agri Business Management programme are Agricultural Finance/Banking, Agro Processing, International Agriculture and Trade Policy, Logistics and Infrastructure Management in Agriculture, Marketing of Agricultural Inputs, Management of Technology for Sustainable Agriculture, Rural Advertising etc.

There are several universities that offer online B.Com courses, which may be a good fit for your friend who works in Dubai. Here are some options:
University of Mumbai's Institute of Distance and Open Learning (IDOL): The IDOL offers an online B.Com course that is designed for working professionals. The course includes online lectures, study material, and tutorials.
Indira Gandhi National Open University IGNOU IGNOU offers an online Bachelor of Commerce B.Com programme that is designed to be flexible and accessible. The course includes online lectures, assignments, and exams.
Sikkim Manipal University Distance Education: Sikkim Manipal University offers an online B.Com programme that is designed to be flexible and accessible. The course includes online lectures, assignments, and exams.
Amity University Online: Amity University Online offers an online B.Com programme that is designed to be flexible and accessible. The course includes online lectures, assignments, and exams.
University of Madras Distance Education: University of Madras offers an online B.Com programme that is designed for working professionals. The course includes online lectures, study material, and tutorials.