I guess even if 50% is the benchmark, its obviously in the individuals best interest to perform at the highest possible standard across all tests. I completed the practice test again last night and achieved a better result through not trying to work some answers out accurately and in entirety but deducing what were incorrect answers to speed the process up and cover more questions. Still more revision required though.
A friend of mine went through the process but failed the interview because he hadn't sat one for so long, was not prepared and didn't meet the expectations. He said that the sim component was really easy for someone of his background as a keen computer gamer while others struggled to get their heads around how to operate the basic controls. I've logged a few hours on Microsoft Flight Sim 2004 (and many hours on many other games), so hopefully the sim won't be too much of an issue for me.
But one step at a time - get this online testing through first.