Hi
As Andrea has stated the test is 5.0 based and due to the nature of the DCD even if it was 5.1 based I don't think it would change very much. As for tips I have a page on my blog covering all the resources i used for the VCAP exams here http://thesaffageek.co.uk/vsphere-5-study-resources/vcap5-dca-dcd/ and my experience of the DCD here with some tips http://thesaffageek.co.uk/2013/01/22/vcap5-dcd-my-experiences/
My one massive bit of advice is to do all the reading you can but try get on the Design workshop and do the labs at home and learn why certain thing were chosen. Off of this idea I have recently created a fictional design scenario and am looking to go through it to try teach myself better design and practice for my DCD retake and future VCDX attempt http://thesaffageek.co.uk/2013/02/12/vcap5-dcd-design-practice/
Good luck
Gregg