JMS uses shorthand to refer to its sessions:
Novice: Levels 1&2
Lower level: Levels 1/2/3
Intermediate: Levels 2/3/4
Upper-level: Levels 3/4/5
All-level: Levels 1 through 5
Note: Just because your level is eligible for a session, doesn't necessarily mean that you can sign up. Players with permissions for more than one level will be directed into the appropriate mixed-level game; a skater with L2 & 3 permissions is unable to sign up for an Upper Level (3/4/5) game, and a skater with L3 & 4 perms is unable to sign up for a Lower Level (1/2/3) game.
Also, to ensure parity, we maintain quotas for each level that differ based on the session, and your quota may be full for a particular session. If needed, JMS occasionally relaxes the quotas to secure sufficient skaters to make a session happen.