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Unfortunately, due to the high stakes for the individual child, there is a pervasive problem of inappropriate test preparation in Singapore.

Source (for the whole paragraph)

Hello everybody. What does "high stakes" mean in the above sentence?
I found none of dictionary definitions useful.

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https://dictionary.cambridge.org/dictionary/english/stake?q=stake_1

Search the page for "high stakes". The Cambridge is good for this sort of thing.

By the way, the sentence does not make sense. Bad preparation cannot be due to the importance of test scores.