Can I use only one or two items that relate to specific competencies I require to measure? I do not want to use the entire exercise

If needed you can administer and score the exercise in that manner. However, keep in mind that if you plan on only scoring 2 items, this should be communicated to the candidate in order for them to be able to focus their attention. This then also means that those candidates cannot be compared to other candidates who completed the entire exercise later on. We do recommend that if you purchase the exercise to have the candidate complete the entire exercise and score the entire exercise.