Days 8, 9, 10, 11:
1) Please spend the next four days getting started reviewing on your own in the Princeton Cracking the GRE book (or whatever equivalent print or online resource you are using). The main review advice from your predecessors is to study vocab and to do as many practice exams as possible. As physics/astro students, you are expected to do very well on the quantitative part, so even though the questions may seem elementary to you, do spend some time practicing on them.
2) Click the "Add submission" button, and note that you have completed the above.