Thats good news, i dont think we were allowed to drop standard grades in my school, if we could i probably would habe, although they worked out ok in the end! dont stress to much about standard grades, i was really worried after my maths exam last year and ended up with a 1 (they had to drop the pass mark considerably as it was a really hard paper)
but yeah this time next year i guarantee you will be twice as stressed, oh the joys! highers arent as bad as they make out though.