This is the 8417th most frequent Turkish word.
okulundan
"From his/her/its school."
In this sentence, 'okulundan' refers to receiving something from one's own school, indicating a source or origin.
Ali okulundan çok güzel haberler aldı.
Ali received very good news from his school.
Here, 'okulundan' is used to denote the institution from which the subject graduated, indicating separation or departure.
Mehmet okulundan mezun oldu.
Mehmet graduated from his school.
In this context, 'okulundan' shows that the award was granted by the school, representing attribution.