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@Jen re ANUx Astro courses. Don't be scared. It's a no pressure environment. If you don't do as well as you'd hoped in the assessments it's of no consequence. It's not like a blemish on your academic record like if you went to do an astrophysics degree at uni. And the knowledge you gain will be yours for good no matter what.
The graded problems are not all multiple choice though some are. There is high school level maths involved but just about every type of problem you're asked to solve is illustrated with detailed worked examples. And if you do the course live, you'll have peers, tutors, and lecturer Paul Francis on the forum ready to help (with anything except the final exam).
The test-your-understanding exercises are graded but you get unlimited attempts. In the assignments you get a limited but generous number of attempts. In the exam you also get multiple attempts at questions but it's a bit more strict. But don't get too hung up on assessment. It's not the point of the course. If you do earn a certificate, it's going to be a pass or fail thing, and it won't show your grade. So whether you get 55% or 95%, you end up with the same certificate either way.
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