1. An image formation apparatus comprising: a storage which stores a test pattern; and image formation sections which form an image of the test pattern on a medium, wherein the image of the test pattern comprises divided images formed by being divided into regions in a main scanning direction and a sub-scanning direction, each of the divided images is formed by at least one preset image formation section out of the image formation sections, and a width in each of the main scanning direction and the sub-scanning direction of the divided images formed by each of the image formation sections covers the entirety of a corresponding width of the image of the test pattern.