Don't sweat the exam ... You've gotten through school, the exam isn't the hardest part, geting past school and the instructors was tougher.
I found going into the exam with a good nights sleep and a relaxed attitude really helped me.
You have the knowledge from school, and maybe lifes experience.
Don't overthink answers, try to be objective, read each question carefully.
I'm going to guess you'll do just fine .... Welcome to HELL ;-) just kidding !!
Nursing has been very good career to me, it took a while to find my nitch, but it's Oh So Sweet now.
Please post your success after the exam .... Good Luck, and a prayer will help.