The Ley Wert was unpopular for a number of reasons. It aimed to take power from parent-teacher governance boards and give it to political figures. It introduced streaming for academic and vocational training a year earlier than before, reducing standard schooling for anyone going into vocational training. And it threatened the linguistic immersion system in Catalonia, a system proved to work, in order to downgrade the relevance of Catalan in schools.
From the government's point of view, shelving unpopular reforms after massive strikes and protests may be a mistake. They may be trying to make themselves look flexible.
From my point of view, what they've shown us is that we can win.