I guess it's likely that you think too much,

and it depends on how much you want the job. If you think it's really a good chance for you, try your best and don't think about those cheating stuff, just assume they are sincerely recruiting. If you don't like the guy or don't like to work with them, you can just go there for a "interview training", or you can also just give it up straight away and don't even take the chance.