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You can choose any stream of your interest because to write UPSC exams, you have to be a graduate in any course. UPSC uptakes candidates from any course. You can choose your stream according to the optional subjects also. The list of optional subjects are:
Agriculture
Animal Husbandary and Veterinary Science
Anthropology
Botany
Chemistry
Civil Engineering
Commerce and Accountancy
Economics
Electrical Engineering
Geography
Geology
History
Law
Literature of any one of the non-English languages listed above
Management
Mathematics
Mechanical Engineering
Medical Science
Philosophy
Physics
Political Science and International Relations
Psychology
Public Administration
Sociology
Statistics
Zoology
All the best.

First of all, you need to decide which country you want to opt for an MBA abroad. Say, for example, if you want to opt USA, UK, you should start preparing for IELTS/TOEFL, GMAT, etc. Basically, university require 1st / 2:1 or 2:2 (Grade) Graduation degree with GMAT Score & Some work Experience in respective field. If you want to build your career overseas, UK is also an option as good as USA, because of quality education, high learned faculty and world level infrastructure and procedures. Although GMAT is required for UK, but there are alternate pathways for getting into UK Masters programme. You may do an MBA without GMAT from best universities of UK.