How should I choose what to leave unfinished when revising late would cut most of my sleep before an exam?

At 9:40, I put tomorrow's exam topics beside my work uniform. My shift had ended late. There were four chapters left on the plan I made on Sunday.

I'm seventeen and have to get up at 6:30. Finishing the plan tonight would mean working well past midnight. A friend in the revision chat says we should stay up until we've covered everything, but I'm already reading the same paragraph without taking in much of it.

I know I won't suddenly feel prepared by putting the book away. I also don't want the timetable to become a reason to ignore how tired I am. How could I choose a short, realistic final review and a stopping point when every unchecked chapter feels like a possible exam question? The plan looked much kinder before I filled the evening with an actual shift.