Yes, the official propaganda was all about gender equality, there were movies, posters and newspaper stories about "a working-class woman" (one popular character from "40-latek" series even was called that - her most common line "I'm a working-class woman, I do not fear any job", and in each episode she was doing sth different).
At the same time 99% of the party leaders, managers, directors etc were male, even at regional level. There were still trades where woman were rare (woman on tractor was rare, casue not many woman wanted to do that for a living, woman as a bank director were rare just because). But no problems with getting to the university (incidentaly - you had much better chance to get to university if you were child of industrial worker of farmer, than if your parents were "inteligencja").
Stereotypes about math, programming and gender are also different between countries. Being good at math is cool in Poland, for example, even in primary school. There are some stereotypes about woman similar to that in USA, but nothing on such scale. From my experience around 10% programmers are female here.