While working on my planets and fossils courses, the residential school material arrived.
I finished and submitted the planets/fossils so had plenty of time to read through the preparatory material, and get a copy of the good sciences guide to read too.
I found this second book very boring to read - partly because you shouldn't read it as a book, but use it to help you with specific topics. I also knew a fair bit about it.
I did worry before hand if I could tackle SXR103 without doing the main course, S103, but in the end decided my previous science experience would carry me through. The course was advertised as a standalone one, but it seems to have been a fairly recent change (last few years) so I wondered if it was just for the purposes of advertising.
I'm not going to write up my experiences, as I've already done so else where.
See the informal account and the more formal account I modified so the OU could use it directly.