Feeling over stressed and pressurised?

its my driving practical test tomorrow(UK). i have already failed it twice n tomorrow its again. i am sick n tired of taking lessons. i still make mistakes ,though minor but i am on the losing edge. feeling so worried n stressed. i know i will screw it again because of nervousness. my intructor says im a good driver but sometimes makes hasty decisions. tell me plsssssssss how to control my confusion n nervousness, n calm down my nerves. pls tell me wht shall i do? any tips to pass?