Editing Openai/6932fed8-c6a8-8000-8477-1049d95cb85e (section)

==== 2. What kinds of words and kanji are hardest for you? ====

===== 2.1. Script type =====

Across all reviews:
* Kanji-only words - 12,300 reviews - Again rate ≈ 25%
* Kanji + kana mixed (e.g. 解決する, 改めて) - 8,258 reviews - Again rate ≈ 21%
* Pure hiragana words (かなり, ごめん, etc.) - 1,651 reviews - Again rate ≈ 21%

Among your problem cards, kanji-only words are heavily over-represented:
* In the whole deck, kanji-only = 47% of cards.
* Among problem cards, kanji-only = 64%.

So: your main pain point is kanji compounds with no kana on the front.

===== 2.2. Kanji that appear again and again in problem cards =====

In the top ~150 problem cards, the kanji that repeat most often include:
* 解, 通, 用, 信, 意, 事
* 正, 直, 確, 態, 度, 実

These form many confusing families:
* 解放 / 解決 / 解消…
* 正確 / 正解 / 正直 / 性格 (plus all the せい〜 words)
* 通う / 通る / 交通 / 通過…

So your errors are driven by interference between very similar kanji and very similar readings/meanings — classic intermediate-advanced Japanese problem.

===== 2.3. New cards vs. difficulty =====

You also had huge spikes of new cards at the beginning:
* 2025-09-06: 165 new cards (262 total reviews, again rate ≈ 32%)
* 2025-09-07: 117 new cards
* 2025-09-08: 87 new cards
* Average over the entire period: ~18 new cards/day
* Last two weeks: ~9–10 new cards/day (much more reasonable)

There’s a clear pattern: days with lots of new cards have higher again rates and longer answer times. So overload is a big part of where these leeches came from.

===== 2.4. Time of day =====

Again rate by hour (approx):
* Best zones (fewer errors): - 08:00 → ~9% Again (few data points but very good) - 13:00–14:00 → 16–17% Again
* Hard zones (more errors): - 16:00 → 28% Again - 17:00–20:00 → 27–30% Again - 22:00 → 44% Again (few reviews but terrible performance)

You clearly remember better earlier in the day / early afternoon and are much more error-prone late afternoon and night.