There are a number of training programs for the German ab-initio test. I haven't done it myself, but about 2/3 of all wannabee pilot students that make it through the DLR test, have done that. It is never a guarantee for anything and opinions range from "absolute waste of money" to "would have never made it without it". I don't know if they offer classes for the LHI DLR...
Try to contact the following for further info, if you are interested:
ToPilots - Professionelle Vorbereitung auf den Lufthansa Einstellungstest und Pilotentest (I know that they offer training for the DLH ready entry test)
S&P Training - Das DLR-Test-Seminar - Startseite
dlr dlr-test dlrtest pilotentest einstellungstest lufthansatest fluglotse flugbegleiter dlr dlr-test dlrtest pilotentest einstellungstraining für piloten fluglotsen und flugbegleiter DLR-Test (not the best reputation, but webiste also in English!)