Use the below article to analyze your most recent test, then come back here and tell us what you discovered:
http://www.manhattangmat.com/blog/index ... ice-tests/It sounds like you may have been a bit burned out / mentally fatigued. Maybe that also led to timing problems? If you do have any timing problems, read this and start doing what it says:
http://www.manhattangmat.com/blog/index ... anagement/Was there anything else different? Did you skip the essays on the higher-scoring test but do them on the lower-scoring test? Did you stick to the normal break timelines or give yourself more time on break? Etc - basically, was there anything that might have contributed to an artificial advantage on the higher test or an artificial disadvantage on the lower test?
Note that you'll also have the opportunity to sign up for a Post Course Assessment (a test review) with your teacher at the end of the course. Ask him or her about this at your next class.