Does perseverance substitute intelligence?

Practice makes perfect and repetition is the mother of learning. Practice and repetition are essential elements of learning. But how is perseverance connected to student performance? Does perseverance substitute intelligence and can persistent efforts bring better results in test situations as well? Finns are known for their sisu (a combination of persistence and will-power). But are the youth perseverant and did it help them succeed in PISA assessments?
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