Dear Ambition vs Reality:
Work experience as a part of the admission criteria for MBA is just one component. It offers insights into another dimension of an individual's potential for success. It is not a substitute or replacement for your academic performance.
Your undergraduate performance is a critical element of the decision-making process. Top MBA schools often do not even consider students with GPA below 3.5 or thereabouts. Even if you produce a high score on a standardized exam, such as the GMAT or GRE, your chances of being admitted are very low. Diplomas are not college or university education; thus, the performance on diplomas is interesting but not particularly relevant.
There is very little financial aid is available to international students for the MBA. And that which is available is very difficult to get.