In today's job market, any kind of advantage you can muster is important. No longer are there jobs available for anyone who seriously wants one, so having the credentials available to prove your worth is essential. And, the only way to have the best credentials is to earn them from the best college or university you can. This means you have to have great SAT scores.
While the SAT, or Scholastic Aptitude Test would seem to be a bit outmoded in what it is testing, at this point in time it is the baseline used by virtually every college in the US. This means in order to be considered by the best schools, you have to know how to take the SAT. Not only do you need all the book knowledge that can be covered, but there are a lot of other aspects of intelligence and aptitude the SAT covers which knowledge alone won't cover.
This is where finding a good prep course makes all the difference. Having good grades will not ensure a high score on the SAT. If an A student has not prepared thoroughly for the test, they might be surprised at how different it is from their normal testing scenarios. It is possible to find prep courses that can handle the logic and common knowledge aspect of the test. It is possible to get into quite a few schools without having any kind of SAT prep, but your chances of getting into a very good school increases exponentially with the use of a good SAT study guide.
While these guides alone aren't a guarantee of success, most include several SAT practice test samples. Sample tests will help prepare the student for how the actual test will look as well as the quality of questions that are going to be asked. Preparing for how the questions will appear on the test is an important part of prep work. This will make sure the student is not thrown off by the language used on an actual test.
Another quality of an effective prep course will be that study times, topics, and methods are all covered equally. The will ensure that study time is built in so that it isn't forced upon the student, but just part of the process. Many will base the amount of study on how well the student is currently doing in school, but others will assume the student is at a certain level and treat all students the same. After all, the goal is to help any student to achieve as close to a perfect SAT score as possible, so regardless of the student, the end goal is the same.
While success can be measured differently, for most it comes down to the career they will start once graduating from college. And in order to do that, getting the most from your SAT prep is a good start on that final bottom line goal.