1) Review both the critical bugs and those found during isotesting throughout the cycle. This is handy in case you find something during testing and want to know if someone has already reported it or not.
2) Make sure you know how to use the tracker and how to test an iso. When the milestone is created and the images appear on October 10th, you want to be ready to go!
3) Test and report your results to the tracker ;-) Note, at this point in the cycle we prefer real hardware results. Upgrade your machine! Try a fresh install. If you've been sitting on raring, now is the time to migrate to saucy and let us know of any bugs you find.