It's never too late to do something, the issue is if that'll be enough to get you to where you need to be.
Exam load is always a nightmare, too much pressure. My motivation comes from a combination of the fact that I find interest in the majority of the topics, it's just a load to learn for now (once the exams pass the pressure if off) and anticipation of the next step.
There's always an element of learning for the sake of the exam unfortunately. At this point perhaps looking for "ideal" answers would be your best bet? Or learn the basic concepts and you should be able to apply them.