Level 1 (Access to lessons 1 to 10)
Level 2 (Access to lessons 61 to 70)
Level 3 (Access to lessons 121 to 130)
Level 4 (Access to lessons 181 to 190)
Level 5 (Access to lessons 241 to 250)
Level 6 (Access to lessons 301 to 310)
Level 7 (Access to lessons 361 to 370)