Beyond readying your documentation, there is some other preparation you can undertake ahead of IMT interviews.
It is not really possible to 'revise' before the interview, although of course it is always sensible to review your application form, experience and skills to date, achievements, etc. in advance, and to prepare yourself more generally as you would for any interview.
Certain questions at the interview will involve discussion of particular (brief) scenarios, but information on these will be provided to you on the day.