There are limits, but how do you really know if you've reached it or not?Don't find yourself say "if I only did more this or that"I know I haven't done everything that I could do. I have worked 25-30 preptests (though not all full exams) and I have not reviewed as intensively as I should have. I think this could give me a 5pt advantage and I can spot areas of potential improvement. People have other things to do and they have to get on with life, so your ultimate decision rests on your ability to know yourself.
There is a limit. You also need to lessen the pressure. You sound like you're allowing the test to control you. Understand that a 160+ is a good score, and besides, this test DOES NOT reflect your potential as a lawyer. When you realize this, you will be ready for the test.