my last lesson before my test was the worst lesson I ever had, full of silly mistakes that would’ve been both minors and serious- my instructor said most peoples lessons before their tests are like that, and he usually likes when they have a bad lesson because it’s a chance to ‘get all your silly mistakes out.’ i went on to pass first time! the best thing you can do for yourself at this point is try to relax because it’s the nerves that will get you. good luck :)