Here are a couple of suggestions. Build a roadmap (Kaplan
term sry) that basically restates the contents of each paragraph in 1-2 sentences. That way you know where to look if a Q asks you about a particular topic without providing line references. Also, read through the passage once get the gist and then move on to the questions. Remember you don't need to memorize the passage just have a good idea of what it says and its structure. The questions will tell you where to look and then you can go back in reread 2-3 sentences and answer the question. This way you should avoid rereading multiple sentences, and improve your accuracy. Also, there are a bunch of posts on this topic search through the site and you'll find a host of other strategies that may help you. Last of all, the best way to improve is practice. G'luck.