I feel that the day you learn a technique and rep it 15 times is not the day you drill a technique. Example. June 2012 you were taught how execute an Upa and roll mount escape and put in 15 reps that day with a partner. July 2012 you use the Upa and roll sucessfully several times with various opponents during roll time. August 2012 your instructor does not teach any new techniques that day and asks that you perform Upa and rolls with several opponents for 30 minutes straight at 40% then 15 minutes at 80% and he gives you no further motivations. Do you roll your eyes and say to yourself " I know this already and I am good at it", then proceed to perform in 3-4 times in 45 minutes (all at 100%)with maybe 2 partners and mostly just have to drink, go to the bathroom, talk. Are you a good student and try to perform the task as instructed but find it difficult to have a commited partner. I find most students(at our school and the many others I have visited) tend to be the former rather than the later. Unless the istructor has the energy and drive to stay on peoples asses and say "come on , lets keep going" over and over.
To really get a task, you need to perform it over and over with good realistic resistance, but low enough that you are able to perform it technically perfect each and every time, so you mind/body can remember the moves. If you do not drill as instructed, chances are you will be able to continue to use it during gym roll time, but will not be able to pull it off when the real pressure is on. ie. real fight after getting slammed to the ground, competition match, MMA fight after taking 3 fists to the face. Sorry, just my personal pet peve rant.