This is the 299th most frequent Hebrew word.
בהן
"In them" or "among them."
The word 'בהן' refers to 'among them', specifying something within a group or collection.
הספרים שהביא כללו מגוון נושאים ובהן גם היסטוריה.
The books he brought included various topics, and among them was history.
In this sentence, 'בהן' means 'in them', emphasizing that something (modern programs) exists inside other items (the computer stations).
בחדר עמדות מחשבים רבות ובהן תוכנות חדישות.
In the room, there were many computer stations, and in them, there were modern programs.
Here, 'בהן' refers to 'among them', indicating something present within a subgroup (in this case, success among the female students).