My daughter, now nearly 40, was never diagnosed with dyslexia at school, when she was 21 I saw a TV programme that said the colour black is a mixture of colours and that a dyslexic eye/brain does not recognise one or more of the colours.
The programme said go to an optician and ask to be tested to see which colour is missing, get glasses with the lenses in the missing colour , in my daughters case bright orange, and wear the glasses for reading and writing.
The night she got her glasses she read for the first time .
Her son, again the school refused to accept he was dyslexic needed purple glasses.
This is not going to cure all dyslexics' , have you had your child tested by an optician? if not do so it costs nothing, if your child does need special glasses get the cheapest possible as they will only need them for a few weeks it seems the eye/brain learns to see the colour.
It is not just my family this has worked for, I have told others and it has helped their children.
Also the chemists have capsules of Evening Primrose oil and fish oil these also helped my grandson and others.
I know this doesn't answer your question but it may save you having to do the course.