This is the 15000th most frequent German word.
schulischen
"Schulischen" relates to "school" or "educational" matters.
In this sentence, 'schulischen' is used as an adjective in its plural attributive form to describe 'Aktivitäten', meaning activities related to school.
Die schulischen Aktivitäten der Schüler sind vielseitig.
The students' scholastic activities are diverse.
Here, 'schulischen' is used as an adjective in plural form referring to 'Leistungen', indicating aspects connected to school or education.
Er hat großen Erfolg in seinen schulischen Leistungen erzielt.
He has achieved great success in his academic performance.
In this instance, 'schulischen' is an attributive adjective modifying 'Anforderungen', describing demands linked to school settings.