What should we generally aim for on these practice tests? It's kind of frustrating since I've looked at the score conversion charts at the back of the book for tests 4-10 and they vary a lot. So if I get a raw score on any other random test they have w/o the chart, I'm kind of lost about how well I actually did, since the converted score heavily depends on the difficulty of the test as a whole, which I'm having trouble estimating.