Your Kid’s Grades Just Went Up. Here’s Why That Might Be a Warning Sign.

If your child’s homework scores have quietly climbed this year, that’s good news — unless AI is doing more of the thinking than your child is. A new study of 26,811 students in China just put hard numbers on a pattern a lot of parents have felt but couldn’t prove: AI can make homework look better while making the learning underneath it worse.

Researchers from Stockholm University and the University of Hong Kong tracked these students for 30 months — homework scores, completion time, monthly exams, and entrance-exam results, across nine subjects. Here’s what they found. When students started using generative AI on homework, their homework scores went up 18%, and they finished 30% faster. Sounds great. But within six months, their monthly exam scores — taken closed-book, no AI allowed — dropped 20%. And on the exams that matter most, the high-stakes entrance exams, scores fell 18% to 24%, with the full damage only showing up after about two years.

The researchers found the losses weren’t spread evenly. About 80% of the AI-using students showed a specific pattern: exceptionally short homework time paired with unusually high homework scores. In plain terms — they weren’t using AI to check their work or get unstuck. They were handing the thinking over entirely and turning in the result. The study calls this “homework outsourcing,” and it’s the group where almost all of the exam damage showed up.

Worth saying plainly: this is one study of Chinese secondary students, grades 7 through 12, not U.S. homeschoolers. The exact numbers won’t map onto your household. But the mechanism the study describes — a tool that produces a correct-looking answer without requiring the struggle that builds understanding — isn’t specific to China, or to any curriculum. It’s specific to what AI homework tools do.

Why this happens: the gap between Explain and Sustain

At Auxesis, we talk about three conditions a student has to clear before we call something “mastered”: they can Explain it in their own words, Apply it to a new problem, and Sustain it — meaning it still holds up weeks later, without a crutch in the room.

A homework score only tests the first condition, and sometimes not even that — it tests whether a correct answer got produced. AI is extremely good at producing correct answers. It is not able to build the second or third condition for your child; that only happens through the struggle of getting an answer wrong, figuring out why, and trying again. A rising homework grade with a sinking exam grade is what it looks like when a student is clearing gate one on borrowed thinking and never reaching gates two and three at all.

What this looks like at your kitchen table

Say your child brings home a worksheet on solving for x, and it’s done in ten minutes with every answer correct. That used to be a great sign. Now it’s worth one follow-up question before you sign off on it: “Can you solve one more like this — right now, out loud, no notes?” If they can walk you through it cleanly, the homework score was earned. If they stall or reach for a device, the homework score was borrowed, and today’s a good day to slow down and actually work one problem together.

Three guardrails, not a ban

You don’t need to take AI away to fix this — the study’s own data suggests the damage comes from a specific misuse pattern, not from AI existing in the house.

1. Closed-book check-ins. Once a week, pick one homework problem your child already turned in and have them redo it with no tool in hand. This is the fastest way to see whether a grade reflects understanding or output.
2. Subject-specific limits, not blanket ones. The study found losses were worst in social science subjects, then STEM, then languages. If you only have bandwidth to watch one subject closely, watch writing and reasoning-heavy work before you watch math drills.
3. Ask what mode it’s in. Some AI tools default to giving answers; some can be pushed into asking questions instead (the difference between an answer machine and a Socratic tutor). Which mode your child’s tool is in matters more than whether they’re allowed to open it.

None of this requires panic. It requires knowing the difference between a grade and an understanding — and checking for the second one every so often, out loud, without the tool in the room.

If you want a simple way to build that check-in into your week without becoming the homework police, the Parent Track walks through exactly this kind of mastery tracking — a five-minute weekly habit, not a new curriculum.