In my organisation we have to do Koryo for first to second dan, Keumgang for second to third, Taebaek for third to fourth, Pyongwon for fourth to fifth, Sipjin and Jitae for fifth to sixth, Cheonkwon for sixth to seventh, Hansoo for seventh to eighth and Ilyo for eighth to ninth. I havent had to learn any of these yet though! Just what i found out from a website