Anyone unable to take any time off work?

I need some advice/suggestions on how to cope with a crazy work schedule in addition to studying for the final stretch till the exam. Unfortunately for me its our busy time at work so time off is not an option (although I have a half day Friday June 1st - YAY). Or is the best thing just not to sleep and sleep after June 2nd. I still need alot of work in terms of memorizing formulas and getting a deeper understanding of the concepts (scoring around 67ish on scheweser practice exams). Feels like time off is critical but is it doable without?