The swaggies in Investment Banking always had to go to special institutions, specially in UK, USA, France, some private German business schools to raise their calculated chances but it has never been obligatory, there are many non-gone ways to ecxcel.
Most Cambridge graduates don't go to become Nobel Prize winners and keep cooking with water but as the school is very selective they entirely would end up in the top 1/3 of graduates among the 25 leading German universities.
Some initiatives as TU9 universities group and German Excellence Initiative are rather successful to rise awareness for German Universities and also to get researchers back from the USA to Germany.
The four academic elite institutions Max Planck Society, Helmholtz, Fraunhofer, Leibniz Society get closer to the leading universities to give them some branding and more cooperation.
For general mathematics also TU Kaiserslautern, TU Ilmenau, Jacobs Uni Bremen, TU Berlin, Uni Lübeck, Uni Saarbrücken are first choice, not necessarily having the strongest development dynamics, as the Excellence Universities which begin to hire from foreign terrain as the competition has become more intense. To get the best global students you sometimes need to be bad ass when you can.
;-) In doubt the master studies can at least be compared to the 7th grad of the Martin Andersen Nexø Highschool.