how accurate is it for say 2002, and possibly this year? like how many marks off would u say???
so there's no way to update it? but i dont wanna pay $15 to get told im goin to fail..........
It really varies quite a lot - if you're right at the top, it should only be off by one or two points, but for most of the 'middle' range it could be off by as much as 10. That's why we're not recommending you use it.