To Reverse Page Order
The page order of a document is often reversed when the file is prepared for printing; this is a convenient way to collate a document on printers that produce pages printed side up. To reverse the page order of a document you are viewing:
Choose Page Viewing Controls from the View menu.
The Page Viewing Controls dialog box appears.
Select the order in which you want the pages of the current document displayed (First Page First or Last Page First).
Click OK to apply your choices and close the dialog box.