4.3 Division of responsibility for control between air traffic control units
4.8 Change from IFR to VFR flight
6.7 Operations on parallel or near-parallel runways
7.12 Procedures for low visibility operations
Chapter 8 ATS surveillance services
Chapter 10 Coordination
Chapter 15 Procedures related to emergencies, communication failure and contingencies
Theoretical knowledge for C1 rating should be a compilation of all previous theoretical courses of ratings STU1, STU2, STU3, plus mandatory training for Tier 2 endorsements: AFISo and Procedural Tower.