Leaked training documents appear to be internal training material from NCC Group, an information assurance firm in the U.K. A suspicious-looking leak of documents that showed up on GitHub appears to have originated with the company. The documents were contained in a top-level folder called “CREST-Exam-Prep” created by the “jaffarahmed” account and labeled as being “cheatsheets and write ups for the CREST CRT and CCT Exams” The documents have been removed from GitHub, although apparently not before being “forked””]
Source: https://www.cuinfosecurity.com/blogs/crest-penetration-testing-certification-being-gamed-p-2931