160 on GRE verbal is a good score. In order to achieve this score, you need to maximise your accuracy in sentence completion questions -1 blank & 2 blank. You also need to have a good hold over sentence equivalence questions with 100% accuracy. In order to maximise your accuracy in fill in the blank questions as stated before,you need to learn vocabulary thoroughly and should be able to identify whether the blank is positive or negative reading the words near the blank with the help of connectors. Also, you need to score perfectly in critical reasoning questions. In Reading comprehension -you should answer all direct location based questions correctly. You can afford marking 2 wrong answers if 5 questions are asked to you.this depends on the number of questions in the passage. Short passage questions are more twisted than lengthy passages. Understand the gist of the passage. Don't get into the technicality of the passage. Your reading speed and level of understanding should be good. I am retariating level of understanding should be good means understanding the passage as a conclusively,not each and every word/sentence in the passage. This will answer your primary purpose question. In inference questions you need to read backward and forward of the located part in the question to get the answer. Attempt consider each choice separately last