I have completed the course just this year.. and achieved DDD, i thought it was VERY easy, they guide you through the whole course, for the assignments you will get the criteria layed out for you, then just have to go away and research + put into your own words. Of course this depends on the person, as some people still managed to fail.
But as long as you know the basics.. and i mean the basics of computers you will do fine! We had someone who didnt even know what a floppy drive was on the course and he did ok... lol