If you need to study, do so. Study hard until dinner time the afternoon before...then relax, get some exercise, have a nice dinner and a beer (as in A beer, not ten beers ).

Break your studying into two categories:

Must Know: This is the stuff you know you will get asked, and must know 98%. You probably have acronyms for most of this, and it probably fits on 2-3 sheets of paper. Make certain you know it cold, and focus on this stuff as the checkride approaches.

Nice-to-Know: This is all the other info that you might get asked. You will need to know 70% of this stuff, but if you're a little weak on some details or you need prompting it will still be OK.