This is not necessary. Of course, you may opt to take a new training course as a refresher (to ensure the issuance of a new certificate). But with the High-Risk Tasks training courses (certificates valid for 10 years, with an intermediate evaluation after 5 years), for example, ECS can provide the observation for the practical test.
In addition, refresher courses can be scheduled for some training courses. Please contact us for more information about these courses.