Is it permissible to pay money to a doctor to obtain a sick note that permits absence from studies, if attendance is a waste of time due to the negligence of the professors?

Paying money to a doctor to write a certificate that contradicts reality involves two prohibitions: First, it causes sin and evil, which is the doctor's lying in his report. This falls under the prohibition of cooperating in sin and aggression. Second, paying money in exchange for falsifying facts is a forbidden bribe, and the Prophet, peace and blessings be upon him, cursed the briber and the bribed.