How did you tackle the language & culture part of these courses ?
June 14, 2020
December 27, 2020
I'm sorry you never got a reply to this, hopefully it's not too late to give my own input.
IMO I wouldn't skip the vocabulary; I think they are very valuable. What I've been doing is creating flashcards with the vocabulary in the various lessons. You can use something like Anki, or your flashcard app of choice. Then over time you'll have no problem remembering them.
I think the Rocket courses work best with an external flashcard app using spaced repetition. Otherwise how could you ever remember all the vocabulary, even in the lessons?