There is a blurb about them on the game page (https://sundialgamesllc.itch.io/2022-quest-calendar) under the heading "Suggestions for Printing"
There are 3 different zip files with different formats: 1x1 for printing each page on its own sheet. (Front, back) 2x1 for printing 2 pages on 1 sheet (Front x2, back x 2) 2x2 for printing 4 pages on 1 sheet (Front x4, back x 4)
All formats are designed so that when you print front and back, the pages align correctly on the backs of their front. The resolution to a given page, is on the back of the previous page.