Microsoft Flight Sim 2002. That's what the FNPT2 sims use as their software!!
Just start with basic straight and level, then move on to timed turns then climbing timed turns.
Start looking at the approach plates for various places relevant to where you'll be training.
Anything that gets you practising awareness. I was told not to do any pre study as i'd be taught it all on the course, but I feel I could have been better prepared, had I looked at certain things before embarking on what is essentially the hardest flight test you'll probably do.
Anyway, have fun.....I didn't!