What online documenation is available during the RH EX280 exam itself?
Does a candaiate have access to docs.openshift.com ?
Highly recommend getting 100% familiar with all of the documentation on the page listed above. Check out the HTML and PDF version to see which one you can navigate easier and keep in mind the HTML version does not have the index on the side on this test.
The PDF does, but you have to open the documents on the command line with a tool that they mention as the only reader available on the computer. Do it early and immediately.