Is concealing a previous surgical procedure when applying to the College of Nursing considered a false testimony, and would the money earned from working with this certificate be unlawful?

Lying is one of the most heinous sins with which a servant meets his Lord. It is a characteristic of hypocrites and leads to Hellfire. You have done well by regretting what you did, and you must resolve never to return to lying. It does not appear that more is required of you than what has been mentioned for your repentance to be valid, because there is no certainty that the university's knowledge of the surgical operation will lead to your rejection, as long as the operation has not affected your hand or your health. It does not seem that you took someone else's place or that your certificate and salary are unlawful. Strive to correct and complete your repentance and be truthful in all your affairs.