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Grading is tough. I second @Alta12's advice that spending too much time grading doesn't make much sense. Even if your answer doesn't match the model answer doesn't mean that it doesn't work. And model answers are almost certain to be extremely long (much longer than what they expect in the exam).
Read the model answers to learn from them, and remember that in the actual exam all they're looking for are the relevant keywords. A direct, single sentence often suffices.
@zee Can I get my Level 3 passed badge