Catastrophe definition, a sudden and widespread disaster: the catastrophe of war. See more.
1 Total Time: The computer-delivered GRE takes 3 hours and 45 minutes for the average student.  Experts recommend sitting for the GRE exam one year prior to entering graduate school. This allows for ample study time and the option to retake it if desired.
GRE scores are only valid for five years from the date taken the test was taken. No other exam scores are accepted - only General GRE scores. The LSU SVM requires all applicants to take the General Graduate Record Exam (subject-specific exams such as the Biology GRE exam are not accepted). The LSU SVM uses both the raw scores and the percentile scores in evaluating applicants.