learner
For a student at college it remains "Student"For a student in a grammar or high school it is "Schüler"or for the American usage of the word it could be "Schulkind"Another word used is "Studiker" (colloquial)
Another word for not old is young.
Another word for kids could be children, juvenile, teenager, youngster and youth.
The student took part in activities.The student was involved in activities.The student was occupied with activities.The student participated in activities.
infatuation
A student of the physical remains of ancient cultures or eras.
young man
Infant, toddler
young teen means young teens another word tween
I truly wished that I would have done better in my classes as a young student.
Baby, child, toddler or young
observant