During preparation for my own interview I put together a set of notes which I attribute a great deal of my success in my MMI's to. Once becoming a medical student, I then digitised these notes and added different sections that I believe are relevant for medical school applicants to know. These have amounted to a 29 paged document which includes:
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How I prepared for my interview.
Useful resources that I used in my preparation. 
Important medical principles that all applicants should know including consent, medical ethics and capacity.
Some common questions to prepare for and my personalised answers to these questions. Examples include "who do you want to be a doctor?","what makes a good doctor?" and "give me an example of when you have shown resilience".
Role play stations and scenarios and how you should approach them. 
Extra questions that you can practice and prepare for. 
The MMI stations that I had in my interviews. 
General tips and tricks in doing well.