Tip: If the file asks for a credit card or survey completion, avoid it. A reputable PDF is usually shared for free by educators or sold via a proper platform like Gumroad or Amazon Kindle.
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Create a mock paper using only the "Try as Examiner" exercises. After finishing, grade yourself harshly. For every mistake, write down: "The examiner wanted me to check X, but I forgot Y." This creates a feedback loop. Tip: If the file asks for a credit