In studies of both secondary school and university students, has been a better predictor of school performance than intelligence scores have been.

In studies of both secondary school and university students, self-discipline has been a better predictor of school performance than intelligence scores have been.

Explanation:

Though the intelligence scores are conventionally looked at as the true indicators of performance in the school and universities, they do not exhibit the real picture of the overall performance of the students. It has been concluded from various studies that an all-inclusive parameter of school performance is 'self-discipline' as it also includes the students who are not good at academics but do well in co-curricular activities.

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