The advanced difficulty of BEC is equivalent to TEM-8. Is this statement reliable?

This statement is not reliable. TEM-8 has a wider scope, and BEC is more advanced and wider.

Certificate in Business English (Business? English? Certificate) is an examination organized by the Examination Center of the Ministry of Education and the Examination Committee of Cambridge University from 1993. This series of exams are all language proficiency tests. According to the actual needs of official or business work, the ability of candidates to use English in general working environment and business activities is comprehensively investigated from four aspects: listening, speaking, reading and writing. Those who pass the examination will receive a standardized and unified grade certificate issued by the Cambridge University Examination Committee.

Because of its authority, the certificate has been recognized by commercial enterprises in Britain, Commonwealth countries and most European countries, and it has become the first choice to confirm the English level of certificate holders, and it is also a "passport" for all countries and regions where the examination is held to apply for jobs.