A High BMAT score would definitely help you in getting scholarship benefits. The BMAT/ BioMedical Admissions Test is an aptitude test used as part of the admissions process for Medicine, Veterinary Medicine or Bio medical Sciences in some universities in the United Kingdom, Singapore and the Netherlands.
Of the different factors that influences students to take up undergraduate Medicine courses in India or abroad are the standard of education, recognition from international bodies, medical councils of different countries, fee structure, cost of living and job prospect. Thus you need to make a right choice based on your need & requirements.
You can get admission in post graduate courses abroad after doing MBBS in India depending on your grades & MCAT score desirability by the University concerned.