Initial training is demanding, it seams as if its designed to push your keys and see how will you behave under pressure, (they don't want a first officer braking a fight mid flight) don't get me wrong, everything is done with professionalism, but expect them to put a little psicological pressure to check how will you react. you have to read and know where to find the information and understand it, it is not a memory game for sure, maybe a few will ask detailed questions but it is not punitive if you don't know the answer as long as you have an idea and where to find it.
A key difference here is that your sim sessions are more like you demonstrating that you know what is being practiced rather than them teaching you from zero. let's say you are practicing balked landings, they expect you to know why it happens and how to recover (the procedure) and on the sim you just demonstrate that, if it isn't perfect there is a tolerance of course and they will probably check your knowledge about it and repeat it next session.
So training difficulty is relative to your level of preparedness and your attitude towards your erros and how you recover from them and accept critics or comments(all your sessions will have comments and things to improve no matter how perfect you think you have done it). if i were to give you and advice is do whatever your sim instructor tells you to do, don't argue and just take notes and do as they tell you, doesn't matter if the previous one told you different, remember your qualification depends on the one sitting in front of you.
be always respectful and professional, prepare yourself and if you commit errors during training (simulator o flight) it is almost always fixable for your next session/flight.
Flight training is more relaxed and less questions, just do your normal procedures as smooth as you can and practice atc if you can due some strong accents a little hard to understand like BKK