For tech issues, please contact
techsupport@manhattangmat.com and they can answer your questions. I haven't seen this particular question asked before on the forums, but that doesn't mean that other people haven't experienced the same problem.
a) For someone scoring in the 700 to 720 range, yes, that person would expect to see a majority of questions in the 700+ range. It depends on how you work your way through the test. For example, I frequently see students who spend more time at the beginning and the middle and do a little better there. Then they're offered harder questions on which they spend even more time. Then, they run out of time before they're done and the score drops because they have a string of wrong answers in a row at the end. But the average across the test is still higher because the person was getting harder questions throughout the middle.
b) The answer to this question depends specifically on your current strengths and weaknesses across question type, content area, accuracy, and timing. If you'd like to share that information, we can give you some ideas.
c) You can get essays graded, but the grading is not free. We have an essay grading service for which you can have two essays graded. You will also be given feedback about how to improve. Contact
studentservices@manhattangmat.com for details. I'd first recommend looking in chapter 10 of OG11 (the orange book). That provides two essay topics and then sample essays at every grading level, so you can write the two essays yourself and then compare to the topics they provide to grade yourself and try to get better. After you've done that, THEN try the essay grading service - write two new essays, incorporating the things you learned from chapter 10 of OG11.