I took about 10 practice tests and my scores have varied from 159 to 172, so it sounds like a large range isn't abnormal. My last tests were also all around 170, so I'm hoping my actual score falls right around there or a little higher (I can still hope, right!?). It seems that scores start out low when you're less familiar with the test and then jump and level off once your confortable with the format. So much of this test is about getting to know the test itself. That doesn't seem to be an accurate measure of aptitude, but rather your ability to study the test. I suppose that still says something.