If we are referring to the CRP-5 (or equiv) a.k.a. "Whizwheel" I can assure you it features very prominently in the JAA (UK CAA) Gen Nav ATPL examination. You *cannot* pass that exam without knowing how to use it for a wide range of calculations - been there, done it (recently).
The continued use of the CRP-5 in the PPL/CPL/ATPL exams in this day and age, is (IMHO) simply to test understanding of some very important basic principles of pilotage; diligence and ability to learn and apply. To argue it should be removed from the syllabus because it has been superseded as a practical tool is kind of missing the point....