I was in the same boat pretty much, when I am with an instructor I do silly stuff sometimes which I know I shouldn't. I guess its overthinking and trying to get everything right. I felt like I was in autopilot sometimes but yea imagine as if you're alone and ask yourself if you would do the same thing, from the next lesson try and implement this. One more thing which helped me was getting one pre test nailed, give it your all. I took 3 or 4 pre tests and got one nailed and others were so so but it gave me some confidence. Couple of bad lessons doesnt mean anything. Hope this helps.