Evaluating my progress

GRE Verbal Problem Solving
1

Hi,

I just wanted to know how I am doing…

  1. How difficult is Big Book considered? Do the tests and sections within get progressively harder? I know within the section in a test there is an order of difficulty…
  2. I just finished until Test 4 from BigBook… I get 5/7 questions right typically on the sections… I get really frustrated for not being able to get the answer… How do people that are expecting 160 score on these tests

Thanks In Advance!