Hi Jaxscc, check out the sticky threads at the top of the jobs page. Most of your questions are answered in those, but off the top of head, the dot group bourdon test is exactly as it is stated; groups of dots. Also to note, depending on the company, the OPC assessments can run over several dates. For example I sat my stage 1 assessment only on one day and then the other part on a different date. MMI is also part of the OPC assessments, and can happen on the same date as the other tests, again company-dependant.