<p>FWIW, in my long experience in education, not to mention as a parent of two very different styles of students with very different test performance histories (both standardized & non-standardized), any student who struggles with test performance and who has tried/failed with self-study, will not be helped by simply MORE self or informal study – regardless of who advises it, how it is advised, how earnestly and “differently” it is advised, or who considers himself some authority on self-study.</p>
<p>At some point, with such students, intervention is the only way. Intervention does not guarantee a score increase, but here’s what professional test prep can do, if done right: </p>
<p>(1) teach strategies of test-taking, which are not necessarily understood well or implemented well when done without guidance from someone who has more experience or is more of an expert</p>
<p>(2) provide strict time parameters (i.e., controlled conditions) in which to practice such instructed strategies. It is easy & natural to fudge on time parameters when practice-testing alone.</p>
<p>(3) compile a statistical analysis of incorrect answers. You can do that on your own, but again, few testers do that in some systematic or disciplined way, and then apply merely the areas of weakness to their <em>further</em>, narrow self-study.</p>
<p>(4) instruct efficiently in the areas of consistent weakness. You would be surprised how many high school juniors & seniors cannot identify certain grammatical rules because they were never taught them and DO NOT APPEAR IN ANY SELF-STUDY BLUE BOOK.</p>
<p>(5) many students have received insufficent mathematics instruction, particularly in the area of concepts and applications (vs. computation), as well as recognition of what category of mathematics is being asked & thus what approach to use. Most of my students have a very disjointed mathematics curriculum which does not link across platforms in a way which would encourage adequate performance on the SAT math section. For those students, professional instruction designed for the SAT math section in particular, is essential.</p>
<p>That said, not all professional test programs are created equal. Some have a much better track record of success than others, because of methodology employed, as well as their training of teachers used and the background expected of those teachers.</p>