If you go to a school you will be issued with their notes. These should be enough to get you through, I wouldn't worry about books just yet. You mention the Oxford stuff on transair. These are the notes you would get if you went to oxford, not supplementary reading.
I went to Bristol, good notes and didn't buy any books. I also know Oxfords are good. Indeed there are tons of good notes. Think you need to research more.