Re DLR test:
Watch out, as the tests are different each time. We had no maths but the supposedly obsolescent zigzag test.
Buy the book and get the Sky-test software and practice, practice, practice.
IMHO the two hardest tests are running memory span (RMS) and visual perception (OWT). For the latter, make sure you train with the correct version (i.e. digits removed!!).
The definitive source of info is:
Pilotenboard.de :: DLR-Test, Lufthansa, AUA, ... :: Infos, Ausbildung, Erfahrungsberichte :: Index
There is a lot written and talked about DLR, whether it's fair or not I can't say and it doesn't really matter because it is as it is. All I can say is put the hours in and you have a good chance. After all I passed it
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KT