The true method of knowledge is experiment.
Auditory Processing Disorder or Central Auditory Processing Disorder is a tough one. These are the kids that are labeled bad, defiant, disruptive, rude, you name it. In my experience, the diagnosis of APD is often late and the families have often gone through hell trying to defend and figure out what is happening with their child. I tend to despise internet checklists for the most part but I have added one in the links here to help parents get an idea if they need to see a professional to discuss some of these symptoms. Please do not diagnose yourself or your child based on a checklist you find online.