Hi mate. Not sure if you've seen this elsewhere already, but these are the 6 questions you will be asked in your MMI tomorrow. They may be worded slightly different but they are pretty much as below;
1. Describe a time when you followed rules and procedures
2. Describe a time when you have solved a difficult problem
3. Describe a time when you have been on a training course over 2weeks or greatest achievement
4. Describe a time when you have handled an emergency situation
5. Describe a time when you have worked for long periods of time alone
6. Describe a role you do similar to a train driver
I think it's harsh having such short notice but I'm sure you'll do fine. All the best buddy