Okay so I need to share this because I was absolutely losing my mind after my second failed attempt. I work in postal operations and my supervisor basically told me I needed the CASS certification by Q3 or I'd be passed over for the lead position. No pressure, right? I scored a 68 on my first try and a 71 on my second — both times I thought I was ready but the address standardization section just wrecked me.
What finally clicked was switching up my approach completely. I stopped just reading the DMM cover to cover (honestly who retains information that way) and started drilling with a CASS practice test every single morning before work. Like 20-30 questions, timed, no looking things up mid-quiz. That consistency over about five weeks made a massive difference in how I was processing address element questions under pressure.
I also found a solid CASS study guide that broke down ZIP+4 coding rules in a way that actually made sense — not just reciting the rules but explaining the logic behind why certain addresses get coded the way they do. Combined that with some targeted exam tips from people on forums like this one and I finally hit an 82 on attempt three. Happy to answer questions if anyone's in the same boat I was.