“I definitely studied this… so why can’t I answer the question?”

It is always a frustrating moment when you come across a question you are so sure you studied for but still couldn’t score high marks. Imagine, you sit in the exam hall, staring at a question that looks familiar. You remember reading about it. You recognise the topic. But when it’s time to actually write the answer, your mind goes blank or worse, you write something that feels right but still doesn’t score well.

So what went wrong?

The truth is, you probably did study. You probably do know the topic. But there’s a crucial difference many students overlook: knowing something is not the same as understanding it.

And that difference is often the reason why students feel stuck studying more and more, but not seeing real improvement in their results.

In reviews of how students actually study, a large share of revision time is still spent on rereading and re-highlighting notes—strategies that feel productive yet show weak or inconsistent gains on delayed tests compared with techniques that force retrieval and application.¹ That pattern helps explain the gap between hours logged and marks earned. Interview-based research on how learners approach academic texts has long distinguished surface processing (noticing isolated details and familiar phrases) from deep processing aimed at meaning—language that maps closely onto the difference between recognising material and being able to use it.²

What “Knowing” and “Understanding” Actually Mean

What Does “Knowing” Actually Mean?

In the context of studying, “knowing” usually means simply recognising certain information.

After a two hour study session, you decide to go over what you have ‘learnt’. You recognise certain key words, you remember the diagrams, and the even important definitions look familiar. And when you read through your notes, everything seems to make sense.

You might even think:

“Yeah, I remember this.”
“This is easy.”
“I’ve already covered this topic.”

But here’s the catch: this type of knowing is often passive.

What does that mean? It means, unfortunately, you’re not truly, actively engaging with the study material. You’re simply only recognising it. And though it can be helpful, recognition can also be misleading. Just because something looks familiar doesn’t mean you can actually use it when it matters.

For instance, we all know how the human brain works. But do we really understand how? This brings us to the question of: what does it mean to truly understand something?

What Does “Understanding” Actually Mean?

Understanding goes a step further.

In general, it simply means you are able to:

Explain the concept in your own words
Apply it to different types of questions
Connect it to other ideas you’ve learned

If you truly understand a topic, you should be able to explain it simply to someone else without looking at your notes. For example, it’s one thing to memorise a definition in biology. It’s another thing to explain why that process happens, how it works, and what would happen if something changed. That level of explanation shows real understanding.

Understanding is active and it requires effort. And unlike passive reading, it often doesn’t feel easy or comfortable, but it leads to much stronger and longer lasting learning.

Across experimental studies, learners who practise bringing information to mind (without the text in front of them) typically outperform those who spend the same amount of time rereading, especially on tests given days later—even when the rereading group predicts they will do better.³ That mismatch between confidence and performance is exactly the “familiar but not ready” feeling many students describe.

Why It Feels Like Progress—Until the Exam

The Illusion of Understanding

This is where many students fall into a trap. Some study methods, especially passive methods, create a false sense of confidence and getting work done. This makes you feel like you understand something when you actually really don’t.

Examples include:

rereading notes multiple times
Highlighting large sections of textbooks
watching explanation videos without self assessment

All of these methods can certainly make one feel productive, engaged and focused. But then you try a past paper question and suddenly, you’re stuck. Those two hours of studying gone to waste.

The main reason is because these methods rely heavily on recognition and not recall. You recognise the information when you see it, but you struggle to retrieve it on your own. This is what’s known as the illusion of understanding; you feel like you’ve learned something, but you haven’t fully processed it.

How Does This Happen?

There’s actually a simple reason for this: your brain prefers easy tasks. It is in our nature to always find the easy way out.

Reading notes, watching videos, and highlighting text are all relatively easy activities. They don’t require much mental effort, so your brain is happy to engage in them. As a result, you feel productive and satisfied after completing them, even if your actual learning is limited.

But real learning happens when your brain is challenged.

Trying to recall information without looking
Struggling through difficult questions
Making mistakes and correcting them

These feel harder and sometimes even frustrating but they are far more effective techniques that actually strengthen your understanding and improve your performance over time.

In short: Easy methods feel productive. Hard methods are productive. Always be wary of falling into the false sense of progression. Remind yourself if you truly benefited from the task at hand.

How Exams Expose the Difference

Exams are designed in a way that clearly exposes the difference between knowing and understanding. They don’t test whether you merely recognise information; they test whether you can use it effectively under pressure.

This is why many students are surprised by their exam performance. During revision, everything feels manageable and familiar. But in the exam hall, when there are no notes to rely on, they struggle to recall and apply what they’ve studied.

In an exam, you are typically required to:

recall information without prompts
apply knowledge to unfamiliar questions
explain concepts clearly and accurately

If your revision mainly involved passive methods, you haven’t properly trained yourself for these demands. For instance, memorising a definition may not help you answer a question that asks you to explain or evaluate a concept. Similarly, recognising a formula is not enough if you don’t know when and how to apply it.

Exams reveal the difference between knowing and understanding. It quickly shows whether your knowledge is surface-level or deeply understood.

How to Move from Knowing to Understanding

The good news is that this is a problem you can fix by making a few changes to how you study. You don’t necessarily need to spend more time studying, you just need to make your study sessions more effective.

Here are some effective practical methods that can help:

1. Active Recall

Instead of rereading notes, close your book and try to recall information from memory.

Ask yourself:

What are the key points of this topic?
Can I write this out without looking?

This forces your brain to work harder and strengthens your ability to retrieve information later.

2. Practice Questions

Use past papers and topic-based questions to apply what you’ve learned.

This helps you with not only becoming familiar with exam-style questions but also:

understand how knowledge is tested
identify gaps in your understanding
improve exam technique

3. Explain It Out Loud

Try teaching the concept to someone else, or even explaining it to yourself out loud. This is a powerful way to identify gaps in your understanding and reinforce what you’ve learned.

4. Summarise from Memory

After studying a topic, write a short summary without looking at your notes. Then compare it to your material and see what you missed or misunderstood.

These methods might feel more difficult than passive revision techniques, but that’s a good sign. If it feels challenging, it means your brain is actually learning and improving on a certain concept.

A Simple Self-assessment Test

At this point, you probably have an idea of the difference between knowing and understanding something. But if you’re still unsure whether you truly understand a particular topic, simply ask yourself:

Can I explain this without looking at my notes?
Can I apply it to a new question?
Can I teach it clearly to someone else in a simple manner?

If the answer is no, that’s okay; it just means you need to move beyond passive revision and include more active study methods like past paper revision and quizzes. There is always room to deepen your understanding.

Conclusion

Feeling familiar with a topic is not the same as mastering it.

Many students spend hours studying, only to feel frustrated when their results don’t reflect their effort. But often, the issue isn’t how much you study but it’s how you study.

By shifting from passive methods to active learning, you can move from simply knowing a topic to truly understanding it. And that’s what exams reward.

So the next time you finish a study session and think, “I’ve got this,” pause for a moment and ask yourself:

“Do I really understand it… or does it just feel familiar?”

This small shift in thinking can make a significant difference, not just in your exam results, but in how effectively you learn overall.

References

Dunlosky J, Rawson KA, Marsh EJ, Nathan MJ, Willingham DT. Improving students’ learning with effective learning techniques: promising directions from cognitive and educational psychology. Psychol Sci Public Interest. 2013;14(1):4–58. doi:10.1177/1529100612453266
Marton F, Saljö R. On qualitative differences in learning: I—Outcome and process. Br J Educ Psychol. 1976;46(1):4–11. doi:10.1111/j.2044-8279.1976.tb02980.x
Karpicke JD, Roediger HL III. The critical importance of retrieval for learning. Science. 2008;319(5865):966–968. doi:10.1126/science.1151758

Knowing Isn’t Understanding: Why You’re Studying but Not Improving