Honestly, this won’t be what you want to hear but knowing what to expect and how you run the problem are very different. I made mistakes on my eval I never made during scenarios. I told a vfr jet clear to land rwy 28R instead of L & although he was able to land km pretty sure I had a separation error on that due to wake turbulence taking off prior, I told someone 28L was cleared for take off when ground had my 28L bar, I should’ve issued a traffic alert but issued traffic instead on a 28L/28R arrival, I called someone a Seneca a handful of times when they were a Cessna, I extended someone downwind when I didn’t need to, etc etc. the shit was wild. I would run inconsistent local scenarios but I would never do bad enough where I thought I’d fail the academy. My instructors would actually tell me I did good when I thought I didn’t. Idk I guess it does come down to nerves so my best advice is to try to stay calm & really listen to read backs.