Similar to the Job placement for students scam, this one comes from companies that promise you “guaranteed employment” if you use their system. That means that you will have to pay for specific “training courses” or so-called “workshops” that you have to take, which also means you will spend your money feeding their “business” and keep it going.
The trouble is that some of these companies are legitimate. Studies suggest that the percentage of useful ones is about 5%.
How to avoid: at that rate, it would be quite a gamble. Only go for it if you actually know someone personally who got a job through them.