How do you know if you are ready for the test?

Hey guys, How are you all, I wan't to share something here, I am a student and i have been studying for my nursing entrance exam for two months straight and I feel like my brain is full. I took a HESI practice test yesterday and I did okay but I am still so nervous. I keep second guessing every answer I pick and it is driving me crazy. The exam pressure is getting so bad that I cannot sleep at night. Do you guys think one practice test is enough or should I do more?