Sofia University St.Kliment Ohridski

QS World University Rankings is one of the top international rankings measuring the popularity and performance of universities all over the world. They measure university reputation based on the impressions of higher education experts, companies who hire graduates, and teaching quality. QS also considers the ratio of international teachers and students present at universities, as well as the times research papers were mentioned by researchers. After calculating and comparing these criteria, QS ranks the universities accordingly.

Best Global Universities Rankings by U.S. News & World Report presents all the top universities from the U.S. and 60 other countries around the world. They measure the rate of students going to their second year of studies, as well as the rate of students who graduate. It also asks university representatives on the performance of universities, and evaluates university resources, teacher salaries, graduation rates, student academic achievements and satisfaction. After calculating and comparing these criteria, U.S. News ranks the top international universities accordingly.

World University Rankings is a vital resource that provides the definitive list of the world's best universities. They look at how often they're producing new ideas, what their reputation is around the world, and how much they're contributing to science and academic fields. After calculating and comparing these criteria, THE ranks the universities accordingly.