Say I'm aiming for two sets of 6 reps on a new weight. And I get 4 reps the first time before failure, then get 3 on the next. Resting and then coming back, I get another 3. At the end of my workout, I come back and squeeze out another 2.
Even though I've completed my target reps, is this going to be as effective as doing full sets? Or would it be better to drop the weight immediately, get 6 reps each with that, and try the heavier weight again next week?