You must pass the Climbing Arborist Certificate of Qualification exam prior to taking the Practical Assessment.
In the Climbing Arborist Standardized Practical Assessment, you will be evaluated by an ITA-registered Climbing Arborist Assessor in all 7 units of competency. You can view the Climbing Arborist Program Profile with information about certification and the 7 units of competency, available from the ITA website here http://www.itabc.ca/program/climbing-arborist
To schedule the exam, complete the Climbing Arborist practical assessment form. Climbing Arborist Practical Assessment Application Form