If you are aiming for 20+ instead of 25+, and you dont have a good reading skill like me, I suggest you NOT to read the passage first. What I did on the actual test was to read around first 3 non-inference questions. If you see an inference question, skip them for now. With those questions in mind, start reading the passage. If you found an answer to one question, read another question and keep that in mind. Keep working like that until ure done with non-inference questions. By now you should have a good feel of what the passage was about. And now try to do the inference questions u left out. if you can't answer an inference question still, SKIP them and move on. And if you have time after going over all the passages, go back to them and try to figure them out. I took this approach and went over all the questions with 15 min to go. Then I went back to the inference questions. After the test I couldve swore i got all of them right but I got only 22. It's prolly cuz I didnt get a good deep understanding of the passage. Its not the BEST method but i think it is an efficient one. AND you wont do well just by reading this but you need to practice this method as much as u can. hope it helps.