World university rankings

Graduation

U.S. and U.K. universities remain world-beaters, with Boston's MIT leading the way, according to widely followed global rankings out on Tuesday.

Six out of ten of the top universities were American, with the remaining four British, in the QS World University Rankings, which judges colleges by research, teaching, employability and internationalization.

Number two in the list were the U.K.'s University of Cambridge and London's Imperial College-which was the biggest climber in the top 10, leapfrogging Harvard, University College London and the U.K.'s University of Oxford.

"In the wake of the recession, both governments and private sector funding sources are placing greater emphasis on high-impact STEM (science, technology, engineering, and mathematics) research, much of which takes place in specialist institutions," says QS Head of Research Ben Sowter in a news release.

"Tech-focused institutions are increasingly the focal point of a global race for innovation. With budgets from public sources increasingly coming under strain, institutions seem more focused than ever on potentially lucrative research in science, technology and medicine."

The universities in the top 10 were all in the U.S.-Stanford, the California Institute of Technology, Princeton and Yale.

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However, students focused on finding a job post-college should head to the U.K., according to QS, which found the two ancient universities turned out the most "employable" graduates.

Those more concerned with getting rich should head to Harvard University however, as research provider Wealth-X ranks it top for number of billionaire alumni. An incredible 52 of its former pupils are billionaires, including Facebook co-founder Eduardo Saverin and Swiss-Brazilian banker Jorge Lemann.

Read More Billionaire U: Why Harvard Mints Mega-Rich Alums

-By CNBC's Katy Barnato

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