In any industry, if you want a job, you have to prepare for it. Going in 'blind' will not showcase your skills as you will not have prepared. Do we as pilots perform a perfect go around without mentally rehearsing it, practising it and then performing it? Have I cheated if I have practised it before my sim check? Course not!
Selection is exactly the same, in every industry. I do not know anyone, in any professional role, that did not prepare for an interview and selection. Part of devising these tests and interviews is to filter those that want the job and those that don't. Those that do, I would argue will prepare and work hard to understand what is required to pass them, as our day job, bares little resemblance to the selection tests - a fact that can be said in all industries!
Top and bottom - you get out, what you put in and add a slice of luck, it may work out. I say this as someone who went through the process.