Only one problem with that quiz. It does not seem to contain parties or candidates that appeared since last mandate. For example, for my country I get candidates that are currently euro-parlamentaries, and not even all of them.
I made another quiz somewhere, I'll try to find it later, with the current parties. Basically it told me that if I want to vote with someone who represents me, I should move to Czechia and vote with the Pirate Party. Sounds about right.