1. Squad Member:To becoma a squad member, you must take the test and pass after going to the academy
2Lieutenant:To Become a Lieutenant, you must kill 5 hollows and one of the squads must have the position available, otherwise you will have to fight an existing lieutenant for his/her spot.this is the rank where a shinigami can train for his/her shikai release
3.Captain:To become Captain defeat 10 hollows and a spot must be open, otherwise you must fight an existing captain for his/her spot.this is also the rank where a shinigami can train for his/her bankai
Captain Commander:to becomee captain commander, you must fight and defeat the current one in a fight after becoming captain