What do you mean by "rep scheme's"

What I've been doing is 8-12 reps x 5-7 sets on my FST-7 sessions at the end of the workout, progressively increasing the weight with every set.. I know we should be 7 sets, but sometimes, I can tell I'm about to die.. and I stop at 5 or 6...

I am in such excruciating intense pain, sweating like a pig and the muscle pumps are beyond anything else I've ever felt in my life!

It kills and my legs are like jello at the end.. but I LOVE IT!!