Conducting a read_through _ A read_through is extremely important. It allows you to step back and examine the points you have made and their relation to the theme and the entire essay. For example, you might discover a certain section that did not help at all in supporting your main theme, or some details that could be better placed in the CV instead. Some even prefer to read their essay aloud or have it read to them so that they can spot lapses or gaps in coherence.
The personal statement is also a great place to explain more serious problems, like less_than_ideal grades or test scores. Don't be afraid to write something like, "I don't test well" in the statement. As long as you can provide a good reason for you app's problems, it's okay to address them directly. You won't be able to hide it from admissions officers anyway, so providing a reason for problems is always preferable to ignoring them.