Boil an egg, finely chop + a package of boric acid, mix. Even half an egg is enough. Spread out on pieces of paper in different places. Soon you will forget about cockroaches forever.
There are more cockroaches than students. An interesting food chain: freshmen eat cockroaches, and so on, in the 4th year you can eat freshmen. The presence of dangerous students who have been bitten by cockroaches usually begins with the 3rd year, but there are exceptions.