1D0-420 exam caught me off guard. It took me a 2nd try before I passed it. I used ucertify Software and the CIW Site designer Bible. I'd say to my fault I first relied on the STS software a little too much, and it did not accurately reflect the type of questions I had seen on the actual exam. With a sigh of relief I laugh at myself as I have the cert now. I began this whole project with the WRONG attitude! I incorrectly thought the exam would be a breeze! It's not. You really need to know your stuff!!! Now at second time most of exam questions are similar to my exam sim and popquiz questions are on my finger tips.