Questions you've got wrong in quizzes and practice tests. Get each one right across 3 separate sessions to clear it.
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How the 3-session rule works: Answer correctly and earn a dot for this session.
Come back after 4+ hours (or the next day) and answer correctly again — that's dot 2.
A third session clears the question for good.
This spacing is what turns short-term recall into long-term knowledge — one visit, one dot, no shortcuts.
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You haven't got any questions wrong — or you've cleared everything. Head to your quizzes and practice tests to build your revision list.