Is it permissible to change a low exam grade and raise it for one's father to avoid his anger and mistreatment?

If changing a grade results in a student getting a job or position they are not entitled to, then it is forbidden deception. Informing the father of an untrue grade is a forbidden lie, but it is permissible for the sake of achieving a benefit or averting harm, such as reconciling disputes. It is preferable to use equivocation to avoid lying. There is no objection to informing the father of an untrue grade if that is the only way to avoid his curses, and it does not result in the student obtaining a right to which he is not entitled.