Dear Aspirant

If i am not wrong you are talking about FMGE(Foreign Medical Graduate Examination) Which is also known as MCI screening test that is conducted by national board of examination.

The Screening Test is conducted twice a year in June and December as a computer based test.

Following countries have the highest MCI passing percentage-

Bangladesh

The Philippines

Nepal

Kazakhstan

Ukraine

Russia

China

Kyrgyzstan

this is the official reports and statistics which may help you but it is not updated-

https://www.natboard.edu.in/pdoof/pnotice2015/FMGE%20MOHFW.pdf

Hope it helps!

Good luck!