Since it's acquisition by Commerzbank, graduate hiring has been closed.
"As a result of the recently announced changes, applications to the Dresdner Kleinwort 2009 graduate and internship programmes are now closed."
The supervised numerical test at Dresdner is difficult. It is unique in that you will be sent home if you do not reach the required standard. Usually this will require you to be in the 75%+ percentile, although 90%+ has been known.
may prove extremely useful in preparing for any of the numerical tests.