Laws were passed limiting Jewish education opportunities
Numerus clausus - a rule saying that Jewish students can constitute only 10%
of the overall number of students of a given university was introduced in Poland
in 1937.
Before the numerous clausus was introduced, there were 20-40% of Jewish students
in most Polish universities. Paradoxically - it saved lives of many young Jews as they
went to study abroad after not being accepted on Polish universities.
Poland wasn't the only country to introduce numerus clausus. Russia introduced it
in 1887, Hungary in 1920, Romania in 1926 and in United States they had numerous
clausus for Jewish students from the 1920's until late 1950's. Especially in north-east
part of the country (e.g. Harvard and Columbia) where the limit for Jewish students
varied from 12 to 17%. So nothing specifically Polish here.
Also paradoxically - the numerus clausus rule, was eventually good for Jewish students,
as there was a very harsh selection and only the best could make it to a Polish university.
This resulted in many of the Poland's best lawyers, doctors and economists being Jewish,
and it was very hard to find a Jewish specialist that wouldn't excel in his field.
Of course, it led to jealousy and xenophobic feelings toward Jews, but that's another
subject.