As far as prep goes;
1. Review speeds/power settings/attitudes for the a/craft you will be flying
2. Plan the flight profiles well in advance and rehearse in your mind the route(s) ie speeds, tracks, heights, radio calls, checks
3. Familiarise yourself with the nav kit in the a/craft, on the ground
4. Know all your airborne checks
5. Review your plates
6. Revise procedures for holds, approaches, go-arounds, general handling, partial panel, visual cx
Multi IR training in a/craft is approaching £8-9/minute these days - much cheaper to learn all the above at home, for free.