maybe bristol are better at drilling it down to their students that this is pretty much self study. Their material is good but it's not perfect, every progress test I do I see questions that are just too tough to answer, I have to google them, really research them.. but this is what distance learning is all about. I'm sorry CATS guys didn't get the memo.. the 3 week revision is not about learning the stuff from scratch.. it's about filling the last cavities in your teeth before you can go to space