The short answer is that you should begin preparing for the SAT exam as early as possible. But the exact amount of time depends on several factors that differ from person to person. You should consider your goal score and your beginning score to determine how much you need to improve. You also need to determine where you need to improve. Do you just need to raise your score in math, or do you need to improve in all areas? You also need to determine how much time per day or per week you have to dedicate to studying for the SAT. Usually, the more time you have before your test date, the less intense your prep needs to be. As a rule of thumb for most students, we highly recommend beginning your SAT prep at least three months before the exam, if not sooner.