Self-study
I find that my previous memories and a mental freeze prevent it from being of any use. Which makes it harder as the 6 minutes runs out quick. I don't have this issue nearly as much with longer sections of hard questions, I have a better control of time then.
I've just started skipping them altogether. I much prefer doing very thorough BRs and moving on.
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Maybe try doing these untimed. The timing wasn't all that important to me when I was doing the reinforce drills. I more so wanted to verify that whatever lesson I was supposed to take from the question was still in there. Whether I could speed through them was not really the point. And maybe without worrying about the clock on these, it actually makes you speed up by accident. I'd try that out and see if it works better for you before giving up on it.