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What extension can help me with Navigation bar (listing all question and also differentiating between answered and unanswered items
Can you be more specific? Are you talking about during test taking, results, or some other function.
This might be what you are looking for https://userguide.taotesting.com/3.3/tests/providing-test-level-instant-feedback
This is more per question but you might be able to create something around Modal Feedback - https://userguide.taotesting.com/3.3/items/modal-feedback
I've read it