I didn't take anything. I don't have examples from my childhood since I have dissociative amnesia for the first 11 years of my life, and I don't talk to my family. But they'll ask you about what you're symptoms are now and what they were like as a child. They should give you really long bubble tests to weed out the possibility that you're faking (the questions get slightly different but repetitive, so they wanna make sure you're not just memorizing the symptoms list). But I didn't bring anything with. Some people have more proof because they've been collecting it so they can convince someone, but it's not necessarily required. I think it's just for their own peace of mind and a reaction to their frustration. The important part is to be as honest as you can with your answers. Even if you don't get labeled as on the spectrum, they might find something else, so being honest (even about stuff you may not want to admit in the testing) can lead to answers.