GMATFix's Official Guide Companion for OG 13th Edition?

Hi folks! I have just started planning for my GMAT prep, and wanted to kick off things with the OG 13th Edition + GMATFIX OG Companion for a deep dive. http://www.gmatfix.com/gmat-book-description/The-Official-Guide-Companion-12th-Ed But looks like GMATFix only has one for the 12th edition. Am I mis...