I’ve been on VCAP6.5-DCV Design in end of April and I passed. The exam wasn’t easy. First of all, the best practices, white papers, books and other documents that I’d to go thru to be successful is tremendous. While, I’ve used many of those in my daily job, one way or another, it would take far longer to prepare If haven’t read any of them. Therefore, plan ahead and make sure you would have enough time to prepare, especially if you have no experience in architecture at all. Personally, the time took me to prepare was more than I anticipated.