Not 100% on topic, but another thing that I think schools can be bad at diagnosing is ADHD: in many cases it’s actually anxiety that manifests as ADHD-like symptoms, and the treatment or medications would be different for each.
(Source: discussion with a child psychiatrist)
Having dyslexic people in my family I can confirm. Often told that the student is "within range" and told that it is nothing to be concerned about until it is. This is often when students are expected to read on their own (3rd grade is the common time in the US). It's common for dyslexics to have very good long term memory but poor working memory. The trick is to work on moving things from working/short term to long term memory.
Good luck if you can even get the schools to step up. All through school I've approached teachers and administrators about the likelihood that my son has some kind of processing issue and could they possibly keep an eye out or provide some kind of testing / resources. Nope, each time told "it's a medical issue, talk to your doctor." Then again - good luck trying to get your doctor to step up too, as sure they will make a referral to a testing center, but you'll never get a call back... this is the stuff that makes life in rural America hard. Limited services for everything.
Public Schools aren’t capable of doing basic things like teaching kids to read so idk why anyone would expect them to do something as complex as diagnosing youth dyslexia
I remember I also had to do an official IQ test first.
The school wanted to know if I was stupid or just could read very well.