In applying to an MBA program you will be measured against people with similar backgrounds. The top schools will have many applicants from India with 4-5 years technical experience, outstanding undergraduate records and GMAT scores over 700. All but two of the top 50 schools in the US report accepting classes with an average GMAT over 640 and 2/3 of the top 50 are looking at score of 675 or above. That will make it very difficult for you to compete.

While the GMAT is not the only, or even the primary, criterion for admission, schools will look at your verbal score and be concerned that your English will not be adequate for the demands of the business school classroom. Realistically, schools are very concerned that the students they accept will do well academically. If they have two applicants with comparable backgrounds and one has a GMAT score 100-150 points higher than the other, the higher GMAT score presents a much lower risk.

You might consider a part-time MBA program. US News now ranks part time programs in the US and many of the top 50 are looking at average GMAT scores in the 500s. A part time program would also be less pressured and allow you to become comfortable with American English.

Good luck,