CHOP is the most-cited practice reference on Examitect's ExAC study plan. It is listed as a primary reference for every category in Section 4 (Construction and practice), as well as for many categories in Section 1 (Design and analysis) and Section 3 (Sustainability and final project). If a question asks who holds the contract, what the architect's obligations are during construction, how fees are typically structured, or how to handle a change order, the answer almost always traces back to a CHOP chapter.
The handbook also shapes the language the ExAC uses. Phrases like "general review," "field review," "instrument of service," "consultant of record," and "scope of services" come straight from CHOP and the contracts CHOP discusses. Reading CHOP closely helps you recognize those terms quickly under exam pressure and gives you a vocabulary that matches how the questions are written.
If you only had time to read one architectural-practice reference before the ExAC, CHOP would be it.