92% and headache

i just finished playing/stuDYING korean alphabet quiz just now and the result is i got 92% and as a bonu; headache...i'll give you the url later for you to try and if you are unlucky like me, you will have headache too...god, i need to lay down now...and btw, never do grammar quizzes
together with hangul...never...the result is more grammatical error...