Helpful in a different sense to what you're thinking.
I wrote two pieces per section (I sat two full exams), and it was at a stage in the game where feedback on every single essay wasn't helpful - some essays he wouldn't have much feedback other than "nice work". It was helpful in the sense that it gave me a greater of quantity of work, so a greater chance of doing something that he would offer criticism on.
It was also symbolically helpful, because I knew the real exam was going to be very simple after doing it twice in one day (ended up coming back to bite me, I didnt' get any adrenaline on the real exam which caused me to run out of time, hard). THAT being said, when I DID run out of time, I had one piece to write in thirty minutes, but I knew I was capable of it because I'd already tested myself and won. So it was like "whatever happens, I wrote six essays in a day. ."
Moreover, my teacher promised a 24 hour turn-around on all feedback, so it was like a mega-troll, because he had to mark all of mine and all of my friend's (we handed a lot of essays in at the same time).
ALSO - I had been procrastinating a lot, so in my mind, the large quantity made my lack of writitng okay and kicked me into gear to write more consistently.
+ fun for a challenge.
Edit: The Suits is strong in this one.
(Fun fact; my dp are those six essays)