Driver's test nerves


I want to take my drivers test before school starts (September 5) but I'm so nervous!! I live in Maryland and I've had my learners permit for a year, I've done all of my incars (driving with an instructor) and yesterday I drove on the highway for 3.5 miles straight. My mom tells me I have nothing to worry about because I can always retake it but I'm so worried that I'm going to fail. Does anyone have any tips to calm myself down/ stories about their driving test?