https://www.oecd.org/en/publications/pisa-2022-results-volum...

  Citing Program for International Student Assessment data taken from 15-year-olds across the world and other standardized tests, Horvath noted not only dipping test scores, but also a stark correlation in scores and time spent on computers in school, such that more screen time was related to worse scores.

Let's see what this study actually says, shall we?

> Students who spent up to one hour per day on digital devices for learning activities in school scored 14 points higher in mathematics than students who spent no time, even after accounting for students’ and schools’ socio-economic profile, and this positive relationship is observed in over half (45 countries and economies) of all systems with available data.

That sounds like school laptops to me.