Honestly, I thought they were hard. After every test I was convinced I had failed. Turns out, I did pretty well.
I studied for the FEAST test on feasttest.com. I know a lot of people say you cannot prepare for the FEAST and it is either a you got it or don't thing, but I disagree.
By doing the exercises on the web tool I got a good idea of what to expect on the real thing. There were some differences, but at least I had practiced to maintain focus for 5 hours straight doing exercises that any person would find challenging.
I think the web tool is a great way how to brush up on those "you got it or don't skills", because, honestly, you could be the best ATC out there, but do you seriously work on your spatial thinking by folding cubes every day? NO.
So do not believe that preparation is not going to do you any good. If you have the necessary skills, then preparation is going to help you bring them out on the big day.