HOW TO NAVIGATE THE FREE GRE POWERPREP II TESTS
First, "purchase" (for $0) and activate the free PowerPrep Online tests using the link above.
Click the blue “Start Practicing Now” button in the lower-left hand corner to get started.
Scroll down and click the blue “continue” button in the lower right-hand corner.
You are now officially using the PowerPrep software.
When you finish the test, you will see what I jokingly refer to as the “Screen of Death”:
This screen has struck fear into many GRE test-takers, because the wording seems to imply that you can either move on to another test, or quit the application...both of which are worrisome because of course you want to be able to review the test results first.
Or, if you're less paranoid about losing your test (you're probably fine but in my opinion, why waste 4 hours of your life if it's going to vanish into thin air!), then when accessing the Review Screen, you could simply write down the numbers of the questions you got wrong, along with your original answers. All you really need to know is the numbers and sections of each question you got wrong, and your original answers, because the question numbers don’t change. Once you have that recorded, then you don’t need to be paranoid about losing your results. I would still try to take a screenshot of my essays, though, and/or save them in another word processing program on my computer.
Don’t worry--it is true that you can’t go backwards when reviewing, but this is not your last chance to review the section. You’ll just have to start over from the beginning. So this scarily-worded "you WILL NOT be able to return" is not entirely correct. You can return; you just can't go backwards in review mode.
UPDATE, JANUARY 2020: here are my recommended GRE books on Amazon.
As a work-around, I suggest that you either: 1) simply write down / take a screenshot of the questions you got wrong and your original answers, using the Review Answers button and then re-start the test, or 2) if you wish to stay in Review Mode, buy yourself a standard function calculator that you can use by hand.
First of all, don’t ever click “Cancel Scores”--you want to have that information! I know this is obvious to most, but no, this is not a Real GRE, so don’t worry, your scores will not be seen by anyone but you.