Magdalene, I am absolutely sure
that standards in education would improve if health visitors/nursery teachers/midwives, psychologists etc intervened more before children started school.
On the whole, middle class, educated parents are better at assisting their children's linguistic and intellectual development than less educated ones, and so their children have regularly been found to do better.
Rehab, modern English begins in the 2nd half of the 14th century, after the end of the 100 yrs war with France, and Chaucer is undoubtedly the main writer from that period. He is already quite comprehensible, especially if u know German. Earlier Englishes were very different and are much less accessible to us now.
Standardisation of spelling was achieved through printing after 1476, but after printers (mainly foreign ones) thoroughly messed up it up first.
U clearly do not know why other European languages have better orthographies than English: they have simply not allowed pronunciation and spelling to become as divorced from each other as in English, by updating them from time to time. The Grimm brothers tidied up German spelling enormously around 1820. If Johnson had done so at least a little bit in his famous dictionary, learning to read and write English would not be as difficult as it is.
People have such daft notions about spelling reforms. When Turkey changed from the Arabic alphabet to the Latin one in 1929, it did not change the Turkish language in any way, just its spelling.
Respelling, for example, 'friend, build, pretty' more sensibly (frend, bild, pritty) would not change those English words in any way either. It would just make learning to read and write them easier. Just as shortening 'inne, itte, uppe, hadde, olde, shoppe' did in the 17th C.
We could at least begin scrapping the still surviving surplus letters which escasped the 17th C cull, words like 'are, have, give, live, dreamt ...'.It would make them and words like 'care, gave, drive, alive, dream' much easier to read.