Hi there,
I did that DLR-stuff in 2006, passed, and flying now for one of those Lufthansa-Companies.
In fact, nobody is competeting agains other applicants.
Everybody is trying to defeat mean values, collected in dozens of years with ten-thousands of applicants. One just needs to be avarage or slightly above avarage.
Initially the tests look frightening, but in the end, it's not too bad - always keep in mind, all others are as frightened as you...
A good source of information is the German
Pilotenboard.de :: DLR-Test, Lufthansa, AUA, ... :: Infos, Ausbildung, Erfahrungsberichte :: Index
You might try to use a translation programme.
Some tests can be trained with those official DLR training software. A good commercial training software is
SkyTest - Preparation Software for: DLR Test (Lufthansa, LH Italia, Austrian Airlines, Turkish Airlines, Royal Jordanian, SunExpress, DFS), Swiss, Cargolux, FEAST (Eurocontrol), Austro Control, Skyguide
It costs some EUR 50,-.
However, that piece of software contains many older tests, which are not used anymore at the DLR; therefore please check out that
Pilotenboard.de :: DLR-Test, Lufthansa, AUA, ... :: Infos, Ausbildung, Erfahrungsberichte :: Index to see which tests are indeed being conducted at the moment.
Good luck,
McFly