for the LST, if you've got a paper holder on your right hand side, get yourself a few flashcards and write down the EFATO and go around procedures for the different type of approaches. keep it concise and clear so you dont have to spent too long or squint. a quick glance during the exercise can reassure you and open up your capacity to think ahead.
Things come at you fast in sim details. forgetting or overlooking small things can really screw you up and you will kick yourself. these mistakes dont necessarily demonstrate any inherent competency issues but is more of a capacity issue. some instructors will recognise this, others might not be so forgiving.
do not discard the technical knowledge you gained during groundschool. a weakness in this might send you down the wrong alley when diagnosing a malfunction for instance.