@SammyRocks I'm not an expert, but I've read that professional testing for ADHD involves gathering a lot of information from you and also from as many adults who know you as possible, to get a complete picture.
Information can be gathered in informal interviews, by an interviewer asking standard questions from a checklist, or by using a rating scale that you complete on paper or on a computer. You can find some simple examples of ADHD rating scales by searching the Internet, but the rating scales used for serious diagnosis are only available for professional use.
There's some more information here: Screening for ADHD with Rating Scales
If you'd ever like to chat about any of this, feel free to click on my profile picture and message me.
Charlie
@RarelyCharlie
Thanks for your information and the link. It was really helpful!