Have you tried converting your scores? If you have concluded that you have a GPA of 2.6 after converting your scores, I would suggest not doing so.
Converting scores does not take into account the rigor of academic practices in various countries around the world. Thus, many schools don’t require conversions anymore. They ask for your complete transcript from the previous degree to evaluate your performance themselves. You can find out whether your target schools prefer this practice or require you to convert scores, on their website.
In case you do need to convert scores, use a reliable online calculator like this one:
www.wes.orgIn case the GPA that you have reported here is the one you have to stick to, then you’ll have to figure out a way to deal with it before applying to any top schools.
You already have a good GMAT score, so now you can focus on any other ways to combat your low GPA. One effective way is to pick up finance and accounting, or Math courses on Coursera.com.
Also, if you have scored well in the finance, Math, or accounting related subjects during the degree when you received the 2.6 GPA score, make sure you mention it as well. Tell the business school that you were not driven by the absolute numbers and were not a part of the rat race, but you did exceptionally well in the areas that should matter to the business school.