Each School year matches up to a specific Rank, except for Bobcat which is a special Joining rank for all scouts 1st grade or above (Lions do a subset of Bobcat as part of the Lions program).
Lion (kindergarten) Lion Required Adventures (do all), Lion Electives (do at least one)
Bobcat (first step for all ranks past Lion) Bobcat Requirements (1-6 are things for the scout to learn and remember about Scouts, 7 needs to be done with a Parent/Guardian)
Tiger (1st Grade) Tiger Requirements (do all), Tiger Electives (do at least one)
Wolf (2st Grade) Wolf Required Adventures (do all), Wolf Electives (do at least one)
Bear (3rd Grade) Bear Required Adventures (do all), Bear Electives (do at least one)
Webelos (4th Grade) Webelos Required Adventures (do all), Webelos/AoL Electives (do at least one)
Arrow of Light (5th Grade) Arrow of Light Required Adventures (do all), Webelos/AoL Electives (do at least one)