Between the bochrim and the kollel yungerleit around 350 (all from chutz laretz). It is not pressured but “structured”. They don’t go on tiyulim. You are there to learn. You have to adhere to the schedule of the yeshiva. The shiurim are in yiddish and most bochurim who do not speak yiddish going in tend to take 6 months to adjust to yiddish.
Does the Rosh Yeshiva have any shaychus with the bachurim? Does he know what is going on ?
Very much, yes. He knows every bochur in the yeshiva and what is the best for that bochur.
Not only does the Rosh Yeshiva have shaychus with the bochurim, but so does his father, brothers and brother-in-laws. From what I understand, his father and mother host 2 – 4 of the bochurim for the shabbos seuda on a regular basis (arranged by the Rosh Yeshiva).