Erm, to be honest, I wouldn't recommend paying even £50 for the course, because there are A LOT of mistakes and its a REALLLLLLYYY pointless course. I stupidly purchased another course (TEFL Express) which is also a load of rubbish (it was exactly the same contents/layout etc, but a more established provider) but unfortunately I can't go back
anyway, the contents of this new course was exactly the same, so I compared the two, and in TEFL Cambridge, it would mark my answers as wrong when I knew they were right, I know they were right because this course is easy enough for a 6 year old to do. I only wish that someone had provided some advice on course before I purchased either of these. If you were to do this course just for some prep for your CELTA I would recommend buying a book instead!