Maybe we can share here knowledge that came out of our study group meeting (and, of course, anything learned outside of the meeting is helpful as well).
Some things I remember from the meeting:
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Look out for the attributes in the code examples ([XMLAttribute], [XMLIgnore], [NonSerialized], etc.). They may help in quickly eliminating 1 or 2 of the multiple choice answers.
Please feel free to reply with more knowledge to share (or any corrections to what I have up so far).