"Did you understand today's lesson?"
"Yes."
That exchange happens in a few million Indian homes every evening, and it tells you almost nothing. Your child is not lying. They genuinely feel they understood it, because sitting in a class where everything made sense while the teacher was explaining feels exactly like understanding. The gap only shows up weeks later, in a unit test, when nobody is explaining anything.
The good news is that you do not need to know the subject to find that gap. You only need better questions.
Why "did you understand" fails
Recognition is not recall. A child who has just watched a teacher solve a problem recognises every step, and recognition feels like knowledge. Ask the same child to produce the steps from an empty page two days later and you often get something very different.
So the aim of an evening check is not to test whether the class made sense. It is to find out what your child can produce without help.
Check 1: ask them to teach it to you
The single most useful question in this whole article: "Explain it to me like I have never heard of it."
You do not need to know the topic. You only need to listen for the shape of the explanation. A child who understood gives you a sequence: this happens, then this, and that is why. A child who memorised gives you a definition and then runs out of road. When they stop, ask "why does that happen?" once. The answer, or the silence, tells you where the edge of their understanding is.
Check 2: ask for an example that was not in class
Textbook examples get memorised along with the concept. So ask for a new one. Where else would you see evaporation? Give me a different sentence with the same tense. If your child can move the idea to a new situation, they own it. If they can only repeat the example from the board, they have borrowed it for the evening.
Check 3: give one problem, closed book
One sum. One question. Books shut.
This is uncomfortable for about a week and then becomes normal. It is also the most honest signal you will get, because it is the same condition as the exam: no teacher, no notes, no hints. If your child can do it alone tonight, today's lesson landed. If not, you have found the gap while it is still small and cheap to fix.
A gap found on the day it appears takes ten minutes to close. The same gap found in an exam takes a term to recover from.
Check 4: look at the notebook, not just the tick
The classwork notebook is an honest record, if you read it properly. Was the work finished or does it trail off halfway down the page? Is the handwriting from today noticeably worse than yesterday, which often means rushing or confusion? Did the teacher actually check it? Are corrections written once and understood, or copied three times without a thought?
Rushed work and shaky understanding usually travel together. We went into the signals in why kids rush homework.
Ask the right question two days later
Here is the part most families skip. Understanding on Monday means very little if it is gone by Thursday. The real test of a lesson is whether it survives a few days without being touched.
So put one question from Monday's chapter into Wednesday's conversation. One line, no drama. If it comes back easily, the chapter is settling into memory. If it has faded, the chapter needs a proper revision, not a re-read, which is exactly the problem spaced revision is built to solve.
Keep a short record
Four checks take five minutes, but their value comes from repetition. Any single evening tells you about one lesson. Twenty evenings tell you something far more useful: that Maths is steady and Science has been shaky for two weeks, or that every wobble this month has been in the same chapter.
A line a day is enough. Chapter, what was taught, how the work was done, where your child hesitated. That is the record nobody has by default, and it is the difference between finding out in October and finding out in March.
What not to do
Do not turn the evening into an interrogation. Four questions asked with curiosity work. The same four asked as a cross examination teach your child to give shorter and safer answers, which puts you right back where you started.
And when a gap appears, treat it as information rather than a failure. You are not catching your child out. You are finding the one thing worth ten minutes tonight, so it never becomes the thing that costs a term.