First!
If you have the extra time in relation to past test passing grades expiring, why not take a week or two away from it? And if you are far enough out and not close to being up to it, extend! I don't really get the studying starting the day after the last part of the test..its crazy, like junky behind a locked door crazy.
This is a long term test with high demands, but taking a break is a good idea if you are feeling the fatigue, or even if you have reached the end of a section. After my first section I had to escape my room, so I took a month and went on a backpacking adventure and forgot anything and everything in the real world, and definitely on that part of the test :). This time around though, I feel like the rest between sections has allowed recuperation for my overloaded coffee addled brain, and I'm only giving it 10 days and I'm be back at it.
All I can really tell you is that you can do this. You have come this far, and giving up, or slowing down is foolish. Be dedicated as a mother hen while at it, and remember to relax after you have achieved your goals. Remember, this test unlocks worlds of possibility, and that's why you will dedicate a year (or two) to it. And not too drag that ridiculous concept back from the dead, but nothing that is worthwhile is easy.
Good luck to all!