The Westlake test for Astronomy wasn't all that bad, it contained some information that you can't just Ctrl+F on your folder of 100+ downloaded Wikipedia pages (in other words, you needed actual Astro knowledge).
Astronomy and Remote Sensing were my favorite two events, and of the two I'd say Astro was harder. There was just so much more you had to know and research and everything that it took the majority of my time. Remote took more general knowledge, so you needed a much wider base of knowledge, the know...