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Discard closes the session. Answers you already gave stay in your history and ability.
All four NCE/SEE domains at blueprint weights, mixed across topics, adapting to you as you go.
Pick topics and levels. Adaptive climbs the levels as you go; Random mixes the levels you picked like a regular quiz.
Every question becomes available again, as if you had never seen it. Your answers, history and ability stay.
Puts your ability back to average (0). Past sessions and answers stay in History.