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.
The cost of taking a GRE is $195 whereas that of the GMAT is $250 â a difference of $65 between the two. Both the GMAT and GRE are computer-based test and can be taken throughout the year, however in areas where computer-based testing is not possible, GRE is available as a paper-based test up to thrice a year.Both the GMAT and the GRE scores are valid for five years.oth the GMAT and GRE are computer-based test and can be taken throughout the year, however in areas where computer-based testing is not possible, GRE is available as a paper-based test up to thrice a year.