Action mapping is intended to be used when you want people to do things differently. If the certification is based on observing learners' performance on the job, action mapping could help. If the certification is based on a knowledge test, action mapping is less appropriate.
You could use the model to create more engaging, realistic activities. However, if the test just requires knowledge regurgitation, you would probably help learners best by having them practice the same knowledge regurgitation. For more on why action mapping doesn't work in education or mere knowledge delivery, see Does action mapping work in education?