<p>Let us say the middle 50% in SAT math is between 700-760 and your score is 790. You are already in the top 25% possibly in the top 5% of the range. 800 may be in the top 3% of the range (as an example). You are already a very competitive candidate and there are very few candidates in that range. The difference between 790 and 800 may not make any difference, it is all the other factors that will come in.</p>
<p>As an example, if you have a score of 690, you are in the bottom 25%. There would be many many candidates with a 700 and hence you are already in weak zone. The fact that you are not even in the 25th percentile could hurt you in more ways than one.</p>
<p>On the other hand, if the middle 50% was 650 to 720, the difference between 690 and 700 will be less significant.</p>
<p>Again this is just a generalization, but further (lower) away that your score is from the middle 50%, your chances go down considerably. At the high end the difference between 790 and 800 usually will not be significant.</p>
<p>At the low end, the difference of even 10 points could be very significant, depending on where you score is in relation to the middle 50%. So rather than talk hypothetically, look at this in terms of the schools you are looking at.</p>
<p>For example at Yale, these are middle scores</p>
<p>SAT Critical Reading 25th-75th percentile range: 700-800
SAT Math 25th-75th percentile range: 700-780
SAT Writing 25th-75th percentile range 700-790</p>
<p>So, with a 700, your chances are very difficult as you would be in the bottom of range, but 690 it will be even more difficult as you are below the 25% percentile.</p>
<p>For Marquette University which is ranked 75 in USNWR, there would be very little difference between a 690 and 700 as 690 is in the top 25%</p>
<p>SAT Critical Reading 25th-75th percentile range: 540-640
SAT Math 25th-75th percentile range: 540-660
SAT Writing 25th-75th percentile range 530-640</p>