According to wikipedia, "MBBS" is an abbreviation for Medicinae Baccalaureus, Baccalaureus Chirurgiae, or Bachelor of Medicine, Bachelor of Surgery in English, the degree given to physicians in countries following the British tradition.
OP - I am not sure if you're asking about "migrating" to medical school in Pakistan or in the US. If you're talking about the US, there are a lot of other requirements you have to fulfill before med schools will consider your application. Also, most of the readers/posters on these forums are from the US & Canada, and so wouldn't have the slightest idea of what is required in Pakistan.
Scholarship Access: Becoming a Student Doctor course
