<p>Yes, I do believe the key is practice. Reading about errors is nice, but practicing helps a lot once you get bored of reading review books and guides and the such.</p>
<p>I view the improving paragraphs as like Critical Reading lite. The right answer will alway be in the paragraph. For example:</p>
<p>Which of the following, if added to paragraph 1, would improve the passage?</p>
<p>ANSWER: Whatever is being added should already, sort of, be there. </p>
<p>Improving paragraphs are hard to explain, and sometimes can seem really subjective, but once you realize everything is stemming from the passage itself, and already needs to be mentioned, it becomes a lot easier. </p>
<p>Improving sentences, in my opinion, are the easiest of all writing MC. If you know your rules you should be fine.</p>