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.
If you are applying to several different schools using one generic statement will be easily recognized and just as easily dismissed. WHY _ because you will be seen as not making an effort sell yourself to this particular school, low effort equals low interest to admissions representatives. Remember the admission committee will likely view thousands of these statements from qualified candidates and they will spot a weakness, flaw or lack of attention to the process in a heartbeat. What you don't want to do is give this committee an easy excuse to dismiss your statement and application.