As the others say, it depends on you and your experience. It's all pretty straightforward, but people tend to have less experience of the standing and sitting/kneeling elements compared to the prone.
Make sure you practice these so you can do them comfortably and consistently. There will be other things to distract you on the day, like the others shooting at the same time. Range Officers can sometimes be pushy if people are slow and that can put additional pressure on. Make sure you do things in your own time and trust your instincts. Also remember that you can fail the Safety element of the test while on the range, so you need to be extra careful about live rifle handling. It's a bit like a driving test - when the instructor says 'mirror, signal, manoeuvre', you make it really clear you're looking in the mirror - the same goes here for muzzle awareness and safety catches etc.
Practice never hurt anyone......