I sat the mock exam without studying and passed. So I thought I’d try the real exam, and passed that too.
Overall if you have been working in the Watson group for 3+ years, where your job role is to have medium to expert knowledge of all (non-Health) Watson products, then you are probably going to find the exam OK to pass.
My only quibbles on the exam is that the technology changes a lot.
For example, all the design patterns for coding conversation before December last year are not that relevant any more, and will likely change again soon. (Which is part reason for lack of updates on the blog, the other being laziness 🙂 )
So you need to know the current active technologies even if they are going away. Plus there will probably be a V4 exam in 6 months or so time.
I’d also like to see more focused certifications for some parts of the Watson Developer Cloud. For example, being an expert at Discovery Service, doesn’t make you an expert of Conversation and vise-versa.