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What's the fastest time for a subject appointment?

You can take the exam in three days at the earliest, because if you want to take the exam, you need to study 12 hours, and you can brush it for up to 4 hours a day, so it will take at least three days to finish it all, and then make an appointment for the exam. Therefore, if students want to take the subject one exam as soon as possible, they can start preparing for the exam after registration.