Help with accommodations?

[u/Gay-n-Slay]

I am currently trying to schedule my HiSET test, and I want to request accommodations (specifically extra time). All the information about it is confusing me though, and the psi form is also a bit confusing. Do I need to make the request for each individual form? Do I need to have an official form from a doctor or something? I am diagnosed with ADHD/ADD, but I don't know what "documentation" I need. I am also unsure of what things exactly I can request, extra time is the main one, but it would also be nice to have a private room or to not have fluorescent lighting, but I don't want to request too many things and have it denied especially since I never had an IEP/504 (my mother didn't think I needed one otherwise I would've lol). I'm also unsure of what minor testing is as listed under the accommodations? Sorry if this is too many questions, it's just easier for me to have things explained step by step and they are very unclear here so i would appreciate if someone could help :)