I am preparing for this exam as well, as I type this answer actually (A Walt S. Diophantine video is playing in the background).
I'll assume you are preparing for the AMC 10 or 12, not the 8. I'll also assume that you're familiar with the 35 official AMC exams on Art of Problem Solving.
This website has 15 PDFs of books that have been extremely helpful, including several for advanced algebra and geometry. These contain tons of practice problems.
These Hungarian problems are also a good challenge.
Walt S. has problem set links in the descriptions of some of his AMC youtube videos like this one. They are a great resource as well!
These should be plenty to practice from for the next two weeks. Good luck!