Hey there!

MCAT is an entrance exam accepted for various MD courses by American and Canadian universities after earning a bachelors degree. You cannot study medicine right after completing standard 12, unlinke India. Studying medicine in Russia and Ukraine is similar to that of India, except it takes 6 years to complete rather than 4 years, as is the case in India. Moreover, you get a MBBS degree in both India, Ukraine and Russia. You, however, need to qualify NEET in order to be eligible for studying medicine in Russia and Ukraine. Also, there is no entrance test taken in these countries.

Hence the highest MCAT pass percentage is in USA and Canada itself (the countries accepting MCAT).

Hope this helps. All the best!