If you have already used your extension which means you cannot extend your eligibility period anymore, I suggest you leave at least a week between your test date and the end of your eligibility period.
You never know, anything can happen, there's a risk that you lose the ability to take the test and thence you need to pay the whole exam fees again.
Your right, I guess I'm just getting nervous and want to get as much time as I can. There's no way I'll ever feel truly ready but is there anyway to mentally prepare for this test because as the dates getting closer my mind wanders more during studying and worrying. Okay I'm going to keep my date and make the most out of this last month Thanks Sabio!