What is the religious ruling on allowing students to talk during an exam, knowing that they have spent years in education without acquiring basic reading and writing skills?

Your leniency with students results in two forbidden outcomes: your failure to carry out the responsibility entrusted to you, which is to supervise students and prevent them from cheating, and your assistance to students in committing the forbidden act of cheating. This leads to the graduation of certificate holders who know nothing. The treachery of others does not justify your treachery. Turning a blind eye to cheating in exams leads to students benefiting in the future from forged certificates. This public money is a right for all people, and no one is permitted to take anything from it except through legitimate means.