My experience and a common one amongst the 10 people I met on the course was as follows.
The interviewer leads you to believe there is an abundance of positions in a well known reputable company. No mention of agencies just the the big name. All interaction suggests you have been successful in you interview and that after some training was completed you would attend an " INDUCTION " and shifts would be organised there after. My advice would be not to be to won over by all the positivity and be more aware of whats not being said and ask those questions. If they seem evasive alarm bells should ring and demand some transparency and direct answers.
Boring. Wouldn't even call it a "interview" if there's loads of people being forced to do maths and English without stating there would be tests.
You are called in for an interview. Forms are filled out. They then have you enrolled on a completely useless course, and try to get you to accept an interview for a job you might not want.