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Study Mode offers an unlimited amount of time for you to answer the questions. They also show the correct answer to the question once you have answered, and allow you to see the question explanation during the quiz. This mode will not be reflected in your Performance Metrics.
Test Mode (Untimed) creates a test environment without the clock ticking. The answer to the question and question explanation is not visible in this mode. This mode will be reflected in your Performance Metrics.
Test Mode (Timed) creates a test environment where you have a limited amount of time to answer a question. You can customize the amount of time per question to your specifications. The answer to the question and question explanation is not visible in this mode. This mode will be reflected in your Performance Metrics.