Go back to the source and relearn the gap

Take each flagged gap back to the material and close it specifically.

Why it works

A diagnosed gap turns vague restudy into targeted restudy: instead of re-reading everything, you spend effort only where understanding actually failed. Relearning right after a failed retrieval attempt also lands harder, because the failure primed you to absorb the answer.

How to do it

1. For each gap question, return to the textbook, source, or an expert.
2. Restudy only the piece that failed, not the whole chapter.
3. Re-attempt the explanation of that piece before moving on.

Evidence

A failed retrieval attempt followed by studying the answer can produce better learning than studying alone — the productive-failure / pretesting line of research — and targeted restudy is more efficient than blanket re-reading. (rct)

The effect depends on actually attempting first; skipping straight to restudy forfeits the benefit of the failed attempt.

Common mistake

Re-reading the entire source from the top, which buries the specific gap in familiar material and feels like progress without targeting the weakness.