The Best Study Techniques for Memory and Retention, Ranked

Why some study methods feel good but don't work

There's a well-documented gap between what students believe helps them study and what research shows actually works. Techniques that feel effective — re-reading, highlighting, summarising — produce a sense of familiarity that the brain interprets as understanding. It usually isn't.

The techniques that produce the strongest long-term retention tend to feel harder. That effort is the point — it's what creates durable memory.

Here are the evidence-based study techniques, ranked from most to least effective.

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Tier 1: High utility (use these every session)

1. Practice testing (retrieval practice)

What it is: Attempting to recall information from memory — past paper questions, flashcards, writing out everything you know about a topic without looking at notes.

Why it works: Every retrieval attempt strengthens the memory pathway. Research from Roediger and Karpicke (2006) found students who studied material once and then tested themselves remembered 50% more one week later than students who studied the same material four times without testing.

How to use it:

• Attempt past paper questions before reviewing notes on the topic
• Use flashcards (Anki) — attempt recall before flipping
• After every lecture: close your notes and write everything you can remember

2. Distributed practice (spaced repetition)

What it is: Spacing your revision out over time rather than massing it in one session.

Why it works: Memory consolidates between study sessions. Reviewing material just as you're about to forget it is far more effective than reviewing it immediately after learning. This is the forgetting curve principle.

How to use it:

• Review new material after 1 day, 3 days, 1 week, 2 weeks
• Use Anki — its algorithm handles the scheduling automatically
• Don't leave all revision to the week before the exam

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Tier 2: Moderate utility (use selectively)

3. Elaborative interrogation

What it is: Asking "why?" and "how?" about everything you're learning, rather than just accepting facts at face value.

Why it works: Connecting new information to existing knowledge creates multiple retrieval pathways. The more connections, the more durable the memory.

How to use it:

• After reading any fact or concept, ask: "Why is this true? How does it connect to what I already know?"
• Explain concepts in your own words rather than memorising definitions

4. Self-explanation

What it is: Explaining your reasoning aloud or in writing as you work through a problem or concept.

Why it works: Externalising your thinking forces you to identify gaps. If you can't explain it clearly, you don't understand it as well as you thought.

How to use it:

• Talk through problem solutions aloud as you work
• After reading a section: explain in your own words what it means and why it matters
• Teach the concept to a friend (or an imaginary one)

5. Interleaved practice

What it is: Mixing different types of problems or topics within a single study session, rather than completing all of one type before moving to another.

Why it works: Blocked practice (all quadratic equations, then all trigonometry) develops the skill of solving known problem types. Interleaved practice develops the skill of identifying which approach a problem requires — which is what exams actually test.

How to use it:

• Create mixed problem sets from past papers across different topics
• In mathematics and sciences especially, interleave different question types

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Tier 3: Low utility (use sparingly or not at all)

6. Re-reading

The problem: Re-reading produces familiarity, not recall. Familiarity feels like understanding. In an exam, where you can't see the notes, familiarity is useless.

When it's acceptable: Skimming a topic you haven't engaged with at all before attempting practice questions. But the practice question, not the re-reading, is where the learning happens.

7. Highlighting and underlining

The problem: Highlighting feels purposeful. It doesn't require you to do anything with the information — just to recognise it as potentially important.

When it's acceptable: Marking a text you'll return to for more active engagement. Highlighting alone achieves almost nothing.

8. Summarising

The problem: Writing summaries is genuinely useful — if done from memory. Writing summaries while looking at the source material is slightly better than highlighting but still produces relatively shallow processing.

How to make it useful: summarise from memory first, then check. The gap between what you wrote and what you should have written is the learning.

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Building a session that uses Tier 1 techniques

A 90-minute study session that actually works:

Time	Activity
0–10 min	Recall test: write everything you remember from last session without notes
10–45 min	New material or problem sets (active engagement, not reading)
45–75 min	Past paper question on this topic, timed
75–90 min	Mark your answer; add flashcards for anything you missed

This structure uses retrieval practice three times (recall test, problem sets, past paper) and produces spaced repetition when you return to the same flashcards in three days.

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The honest conclusion

The best study techniques are not the most comfortable ones. Attempting a question you're unsure about is harder than re-reading material you already encountered. That difficulty is precisely what creates memory.

Students who consistently use Tier 1 techniques — retrieval practice and spaced repetition — typically report needing less total study time to reach the same grade, because they're spending time on what actually creates retention rather than on what feels productive.