You cannot prepare enough for anything.
Taking drugs to overcome nerves is the thin edge of the wedge going in there.
I use the traditional Moyse scale books slightly modified.
By the time I got to the Paris Conservatoire I was very good at the scales and arpeggios.
They are all different and I find it hard to tell what flute suits me best.
Never just run through a study because you happen to be familiar with it, but use it to see what you can get from it on this new day which has been granted you.