The classroom instruction for the CTP is driven by 61.156:
(a) Academic training. The applicant for the knowledge test must receive at least 30 hours of classroom instruction that includes the following:
(1) At least 8 hours of instruction on aerodynamics including high altitude operations;
(2) At least 2 hours of instruction on meteorology, including adverse weather phenomena and weather detection systems; and
(3) At least 14 hours of instruction on air carrier operations, including the following areas:
(i) Physiology;
(ii) Communications;
(iii) Checklist philosophy;
(iv) Operational control;
(v) Minimum equipment list/configuration deviation list;
(vi) Ground operations;
(vii) Turbine engines;
(viii) Transport category aircraft performance;
(ix) Automation, navigation, and flight path warning systems.
(4) At least 6 hours of instruction on leadership, professional development, crew resource management, and safety culture.
Hardly any of this directly applies to the written. The ATP/Higher Power CTP includes Sheppard Air as part of cost you pay. They tell you go through Sheppard on your own before you take the written.