As an ex SATCO with Eurocontrol it annoys me so much that these companies are taking peoples money offering 'help' for the FEAST test.
Honestly, people reading this just take the advice to rest well and prehaps dress well to the feast test and see it as an enjoyable day of puzzles. If you have what it takes to work in Maastricht as a ATCO you will pass the feast test. Be warned though passing the feast test does not mean you have what it takes to be an ATCO (in Maastrict).
I truly beleive that with enough practice you will be successful at any test so you can train yourselve through the feast. But whats the point. You will find yourself failing at some point and be in my situation (and I did not use any training method). Having spent a lot of time that could have been spent developing another career. In my case this equated to 6 months waiting for the course to begin, 9 months of the course and then 4 months after trying to secure another job a total of 19 months that could have been better spent. Bear in mind some people fail right at the end of the course some 2,5 years after starting. I have the greatest respect for EC but they will chop you and tell you not to come in the next day.
These money grabbing feast test trainers make me so mad I would like to set up a free website offering training (I have a background in software development). I won't though as I respect EC too much to screw up their selection (and fear of them sueing me, hehe)
I reiterate BeTs advice
Rest well, dress smart and know some background info on the company.