Questions for journeyman test

Hey guys I’m almost done with my WECA courses I’m planning on journeying out after I’m done. I have the 2020 nec they are asking me to get the 2023 version but I saw the 2026 version is out. I’m confused on which to get in order to study for the test. Also I saw some test prep books on Amazon is there is any good test prep books that you guys recommend? Thanks!