The week leading up to a bee (especially a regional or national bee) is often one of the most stressful weeks of a year. I've had the opportunity to experience these weeks firsthand a number of times. Many people, especially if it's their first time competing at a certain bee, are unsure of what to do in the week beforehand. How to modify your schedule, how to modify your study strategies, and how to mentally prepare yourself are frequently asked (and very good) questions. Here's what worked for me.
Scheduling: Set up your schedule so that you can study as much as possible. Eliminate all but the necessary obligations from your schedule if you can. Write out a schedule each night (on school nights) or day (on weekends) of what you're going to do when. Give yourself breaks though--it's not efficient or healthy to study for hours and hours on end without breaks. Take 5-10 minutes every hour or two to get up, walk around, and drink a glass of water.
Studying: Review, review, review. Go over all the words you've struggled with from everything that you've studied. Then, write down the ones you miss and go over the missed words 5-10 times (it might seem like a lot, but it's absolutely worth it). Then, write down the ones you miss during those 5-10 reviews, and review those 10 times. Repeat the process until you've gotten all your missed words correct multiple times.
Mental Preparation: If you're anything like me, you're probably at least a little nervous. Take some time to get into a good mindset. Envision yourself winning as vividly as possible multiple times, and envision yourself losing once or twice too so that you're prepared for both outcomes. (Mostly envision yourself winning, though--confidence boosts are always a good thing). Most importantly, remember that you've worked hard. Remind yourself that regardless of the outcome, the experience and knowledge gained is so much more important than your placement or a trophy.