In USA a pluls two student can never get admission in medicine school, either he or she must complete bachelor or some pre requisite course from any university. One can get admission in microbiology or some pre med school before you join med school. So far i know pre requisite like general biology, chemistry,immunology,genetics, virology, biochemistry all are important for the qualification for medicine school and for any medicine school they will try to look for the best GPA....i am just wriing you through some of my american friends experience.... and you can search med school from google and it is very expenisive, you need to have plenty of finance as it cost more than 150 or 200 thousand dollar by the time you finish...