Hi
with the CATS online course you log in via their homepage and have access to the course notes, qbank, lecture slides, mock exam papers, + loads more. You do have to stay logged in/online to view them. It is a very good course, and good school for the price. I also supplemented my studies by buying a second hand set of oxford notes, sometimes it helps to have a different view point on bits you are stuck on. There is a demo section you can study the full HPL module for free online, give it a go and see how it works for you.
Go with CATS, save some money, and it will probably allow you to be more flexiable in the order you sit modules etc. Especially as you only need to take 2 consectutive weeks off for gs and exams as apposed to 3 weeks at other schools which is unrealistic to get 3 weeks in a row of work for most people.