How is that spoon feeding when the 6 questions are all over the forum? I dunno what mmi you did, but the one I did in October were exactly those 6 questions. Perhaps you're referring to the DMI ♂️. And of course it would be best to prepare for other scenarios.
When I was applying for driver jobs I did a lot of research into the MMI and how it works. The questions are set by RSSB and are standard across every interview but the wording can vary slightly. They haven't changed since the MMI was introduced in 2013. I collated the following questions from posts on this forum, elsewhere on the internet and my own experience of sitting two MMIs:
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1 Question about rules and procedures
Describe a time when you had to follow rules and procedures.
When have you previously had to follow strict rules to complete a process?
Tell me about a time you've had to follow rules or step-by-step procedures to complete a task.
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2 Question about tenacity and persistence
Describe a time you have been on a training course over 2 weeks.
Give an example of where you had to persevere whilst learning.
Describe a time when you’ve had to work hard to achieve something.
Tell me about a time when you have had to work hard and persevere to learn something new
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3 Question about a role similar to train driver/working alone
Describe a role you have previously done similar to a train driver.
Describe a time you completed a task similar to a task a train driver does.
Tell me about a task or job you have undertaken that shares similarities with the train driver role.
Describe a role which you think is similar to a train driver.
Describe a time when you have worked for long periods of time alone.
Tell me about a time where you've had to work for long periods of time alone.
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4 Question about working to a high standard
Give an example of a situation where it was important that you did not make a mistake.
Describe a time when you have worked to a very high standard.
Tell me about a time you had to do something where it was very important not to make a mistake.
Describe a time you had to maintain a high standard of work while under pressure
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5 Question about an emergency
Describe a time you have handled an emergency situation.
Describe a time where you've been involved in an emergency or unexpected situation.
Give an example of a time when you have had to deal with an emergency, either in or outside work.
Tell me about a time you had to deal with an emergency.
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6 Question about difficult situations
Describe a time you had to complete a task in the face of difficulty.
Describe a time when you have solved a difficult problem.
Give an example of a time you gave good service whilst experiencing difficulty.
Tell me about a time when you had to overcome significant difficulties to complete something.
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At the driver manager interview it's more like a normal job interview and they could ask you anything but the MMI is highly structured and they'll always ask you a question from each of those six topics. The follow up probing or hypothetical questions you're asked are based on your answers to the situational judgement test carried out before the MMI (not to be confused with any SJT they may give you as part of your application before you get to the official RSSB/OPC assessments). I believe the results of the SJT affect the way your MMI answers are scored but I have no proof of that.