In my system (based on the manual one I used to learn Spanish on my posting by Shell to Argentina when a young man), you start by testing yourself on flashcards in the Source of Memory. Test yourself here daily, or several times a week whenever you’ve got a spare moment. Get a word right four times and it transfers to the River of Revision. Test yourself here monthly: get it wrong and it goes back to the Source, but get it right three times and it transfers to the Sea of Certainty. Test yourself here before an exam, a holiday or a business trip and if you get anything wrong, it stays in the Sea but that flashcard is prioritised when you revisit the Sea.
Flowchart + draft screenshots under preparation