Driving test a week tomorrow

I’ve covered everything I need to and have done a couple mock test style lessons, I passed the last two but today I had a horrible mock test and failed making a lot of mistakes, my instructor says I get way too stressed behind the wheel and despite being a really nice person he wasn’t holding back to say he wasn’t even sure if I’d pass. I have 4 more lessons and a lesson the day of the test amounting to 7.5 hours before I actually do the test. Has anyone been in a similar position? And any advice?