SAT is an entrance exam conducted by most colleges and universities to make admissions decisions. Mostly colleges use sat score to decide whether to admit students or not. there are two sections for sat exam : Math, Evidence-Based Reading and Writing, and an an optional Essay. Both the The Essay results are reported separately and the the total test time is 3 hours and 50 minutes. Students mostly find difficulty in writing essay.Online writing services like custom essay writing service provides lots of tips for writing essay.