Where can download all the resources for this course in a single place?
All reference material
Is anyone at ACG monitoring this?
I realize this isn’t the exact answer you probably wanted, but AWS has a great list of links to Whitepapers and FAQs for each exam.
Expand the "Specialty AWS Certifications" (+) and then you should see the Security specialty. Expand "Read AWS whitepapers and FAQs" to see the list of whitepapers and FAQs.