One of the most difficult things to explain to people who are not dyslexic is that learning disabilities are not constant. LDS is not like lighting a room where you can just say that the effect is set or controllable.
People ask me - can you spell, or what is your reading like? Most days it’s just like yours is my answer. After eight years of basic English and with the help of constantly writing new posts for this blog I have improved my style and writing comfort in the last year. Still I have bad days and good days.
Spelling is relative – grammar extra credit. Getting back to the point here – so if dyslexia is biological state and changes from one day to the next in relative effects. What happens when a dyslexic student goes in for a test o a bad day? If the student has the ability to change the test date – nothing will happen. If the school system is not flexible then the student suffers through a hard day.