yeah dumps are a no no, not that it matters for the DCA exams as its a live environment, not something that can really be dumped which I like. Follow the blue print and if you have hands on experience and can cover most objectives pretty well, the exam is fun and not too hard. Felt like I was at work I've really enjoyed the vcap exams.
Dumps don't help you learn but they do help you cheat and in my opinion you should never use them. Like others have said before the VCAP5-DCA is all lab based.
There are some really good study guides on the Internet which will help you prepare. some are as follows;