English exams for ESL students are a great example.
Getting good grades in those exams requires that you know the criteria for evaluating each part of the exam and how to tailor your answer to that criteria. For example, if the exam asks you to write a short movie review you are expected to follow the formula for reviews and show that you can use certain specific grammar constructs.
If you know English well but you don't practice the exam before you will get a mediocre grade, simply because you didn't follow the tacit guidelines that you are expected to know.
Getting good grades in those exams requires that you know the criteria for evaluating each part of the exam and how to tailor your answer to that criteria. For example, if the exam asks you to write a short movie review you are expected to follow the formula for reviews and show that you can use certain specific grammar constructs.
If you know English well but you don't practice the exam before you will get a mediocre grade, simply because you didn't follow the tacit guidelines that you are expected to know.