'Them' does not refer to 'mistakes'. Mistakes are not the subject that struggles, and giving up on mistakes does not make contextual sense.
Comprehension
Top 5 mistakes
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'Them' does not refer to 'marked scripts'. Scripts are objects; the pronoun 'they' in the same sentence ('when they struggled') must refer to people who can struggle.
'Them' cannot refer to 'difficult topics' because the sentence says he never gave up on 'them' even when 'they struggled' — topics cannot struggle. The referent must be people.
The passage says Mr Tan encouraged her; parental pressure is not mentioned. Wei Lin chose to enter because of the personal significance of her story.
The passage shows Wei Lin prepared deeply and found the topic personally meaningful — this is not the behaviour of someone looking for an easy option.
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