Professional frogs are mainly in the financial industry. Official website claims to have been granted Tuhua Series B financing, and the mentor industry covers a wide range, including the Big Four, domestic brokers, consulting companies and foreign banks.
BankerMentor, the only training institution that needs to apply, all others are registered for sales. This self-confidence should come from the super-high-standard mentor lineup. The mentors introduced by official website are all above the director level of foreign investment banks. I haven't applied yet, so I don't comment on authenticity.
No contact with others, no comments.