This is what happens when English teachers are told not to correct mistakes, in exams. So no matter how much effort they put into teaching, no-one has to learn.
I did wonder if the op may be dyslexic but not convinced.
I'm Dyslexic, but can string a sentence together so it makes sense, just.
I have a 'Specific Learning Difficulty' otherwise known as Dyslexia.
Dyslexia isn't just reading and writing, numbers etc.....although these are by far the most common examples, I suffer from Anti-Retrograde Amnesia with Auditory Short Term Recall and Visual Short Term Recall defeciencies....
I have no short term memory, like at all, I was diagnosed at 14 by the Dyslexia Institute when it used to be in Staines after referral by my School. I spent a day doing all sorts of tests and tasks to assess all aspects of learning and ability. Whilst I had above average skill, intelligence and ability, I showed marked retardation's in memory and recall.
After further testing over the following weeks, I was diagnosed with the above and then spent about 6 months learning techniques to help memory retention, a lot of which (for me) relies on tactile feel, like rubbing fingers, tapping fingers, I also use a small piece of cloth that I rub and this helps associate a feeling with a memory and with time, it helps the memory to convert to long term, rather than short term.
My Long term memory is very good, hence why I can remember how to drive, walk, talk, etc as this is learned over and over and is converted into a long term autonomic responses.....
If you ask me - and this is no disrespect to those who really suffer, but the 'excuse' of 'I have dyslexia' is all too often banded around by the yoof of today to cover up for the laziness and lack of effort they put in in their studies....they are using as a get out of jail card for poor results and etc.
I went from school to college to university got a Masters and now work in Design Engineering.....and yet I don't remember where I live, my kids names or what day it is unless it is written down, emblazoned in front of me or I have done all my memory learning techniques to help me remember....I made no excuses - I got on with it!