I studied some grammar from my HSK level 4 book. It was a good review of basic grammar and some new stuff.
Then I did five units from my HSK level 1-4 vocabulary book with the audio. I have been through the book three times already, but I just did the vocabulary for levels 1-3. This time, I’m doing all the vocabulary in the book. Having the audio helps.
Total study time: 1 hour – Grammar: 30 minutes, vocabulary: 30 minutes