Ooooooh, don't get me started...
My mum's actually a professor of English (says so on her diploma), and I sometimes freak out when I read something she's written or listen to her speak...
OK, point in favour for her - she isn't a native speaker, and started learning the language at the age of 14, while most of my friends and teackers here, being Croatian, actually have an excuse for making simple mistakes...
But when we lived in England...o dear God...I was actually told in school that they deliberately put me in group 2 (out of four, 'ranked' by ability) because 'it would reflect badly that you speak, read and write the language as well as or even better than most of our pupils who were born here and you've only been learning it for four years'...Keeping the morale of the majority up by keeping one person a bit behind, I guess
Lot of good it did anyway, all it really meant was that I got to read Romeo and Juliet instead of Macbeth, and still got an A for language and B for literature in my GCSEs...

I'd see the point if the final exams weren't the same for the whole country, and only school based, but this was just ridiculous...I get letters from friends occasionally who've become teachers and economists, and in some cases it takes me a couple of hours to read through and get the gist of the letter...