Some things to do just in case you are a match (and good for your health anyhow): drink water....try to drink lots (they never really told me what lots was but I try to get 8-10 glasses a day), exercise regularly, eat healthy (try to get lots of fruits and veggies and avoid high amounts of sodium). I also tried to get used to only taking tylenol when I used to take advil or aleve (if you end up donating, you'll need to avoid NSAID's). Something I wish I'd done when I look back....journal. I bought one and tried to journal but never quite got around to doing it. Now I wish I'd put together a detailed timeline of when I had to do each step of the testing process at the very least. I do have emails between me and my recipient as well as letters/prescriptions from the transplant center so I could probably recreate the timeline, but it isn't quite the same thing.
Do your research and gather your questions for your coordinator, the surgeon, etc if you haven't already gone through the all-day evaluation (I think you're still at the initial testing phase). I did keep a notebook as my central holding place for my notes, questions, transplant team's contact info, etc. I hope it works out for you! Try to relax and enjoy the process. The waiting is definitely the worst part.