For RC, I don't think there is a textbook method to getting a high score. I would try to read a few science articles a day to maybe boost your reading speeds, and then complete a bunch of timed practice RC tests. Determine which method you are most comfortable with this section, and stick to it. For me, I've always been confident in my reading speed and comprehension. I read the article fully one time, then went to the questions. By reading the article, I could answer many questions, but I also knew where the answer would be located so it was easy to go back to the text. I know others have had success with search and destroy, but I'm not sure if strictly search and destroy can get you a 28 in RC.