I never studied on a Sunday in dental school, even if a final was on Monday. People thought I was crazy. I graduated Magna Cum Laude. What it forced me to do was to study on Saturday.
God blesses those who seek to make Sunday a day of rest. You cannot outgive God. That doesn’t mean that you will get straight A’s, but your character will be forged in a saintly way, and that will be what you are judged on in the end - not your GPA.
As far as Good Friday and Holy Saturday, I don’t see how those would apply.