Grades required for Uni courses have been dumbed down remorselessly.
We now have teachers than can't spell and can't do mathematics teaching those things....
They have also dumbed down what is taught at Uni for teaching. For example I was impressed when one such student told me she got a high distinction for statistics... until she looked at me blankly when I asked her a question about 3 way Anovas.... She had never heard of them....