I did not want to mess-up the test UIDs, so 010 and 020 do not appear in order!
If we do not mind changing the UIDs (i.e. if there are no submitted tests results, stored in a database somewhere), then let's carefully edit navigation_tests.xhtml, navigation_tests.smil and nav.xhtml to swap the UIDs.
PS: "Section Navigation - TOC" *must* appear last, as there is a logical connection with the following test item.