There is a study habit that almost every certification candidate relies on and almost every piece of learning research says is largely a waste of time. Re-reading. Going through your notes again. Watching a video you already watched. Reviewing a chapter you already finished. These activities feel productive — you are engaging with the material, the information is recognizable, and you finish the session with a sense of accomplishment. That sense of accomplishment is misleading.
Recognition is not retrieval. Familiarity with material does not mean you can produce it under exam conditions. The difference between those two things is the difference between passive review and active recall, and understanding it is one of the most important adjustments you can make to your study approach.
What passive review actually does to your memory
When you re-read a chapter or review your notes, your brain compares incoming information to existing traces in memory. If a match exists, processing is smooth — the information feels easy, familiar, and understood. This feeling is called processing fluency, and it is the enemy of effective studying.
Processing fluency feels like mastery but is actually just recognition. The cognitive work required to re-read is low because you are not generating anything new — you are confirming existing patterns. From a memory encoding standpoint, that low-effort recognition produces weak, shallow memory traces.
Robert Bjork at UCLA, one of the leading researchers in human memory and learning, describes this as the "desirable difficulties" problem. Learning strategies that feel difficult produce stronger long-term retention than strategies that feel easy. Re-reading is easy. That ease is the problem.
A landmark study by Roediger and Karpicke (2006), published in Psychological Science, compared three groups: one group read a passage four times, one group read it once and then studied a concept map, and one group read it once and then took three retrieval practice tests. On a retention test one week later, the retrieval practice group outperformed both other groups by a significant margin — despite spending the same total study time.
"The benefits of testing on long-term retention are remarkably robust. Testing improves long-term retention even when the feedback is given long after the initial test, even when tests are given on material that the learner did not initially know, and even when tests cover complex material." — Henry L. Roediger III, Annual Review of Psychology, 2011
What active recall does differently
Active recall is any study activity that requires you to generate information rather than recognize it. The generation effort — trying to produce an answer before checking the source — is what creates strong, durable memory traces.
The cognitive mechanism is called the "testing effect" or "retrieval practice effect." Every time you successfully retrieve a memory, you strengthen that memory's neural pathway. Every time you attempt retrieval and fail — then check the answer and learn it — you create a stronger trace than you would have by simply re-reading the answer.
Failure is productive in active recall. A wrong answer followed by immediate correction encodes better than reading the correct answer from the start. This is counterintuitive, and it is why most self-directed learners avoid active recall — it involves being wrong, which is uncomfortable.
Active recall methods for IT certification study
Flashcard-based retrieval
Anki and similar spaced repetition tools implement active recall by forcing you to answer a question before revealing the answer. For certification study, effective flashcard use means writing question-answer cards that test understanding, not recognition.
Poor flashcard: "What does VPC stand for?" — this tests nothing you would be asked on an AWS exam.
Good flashcard: "A web application in a public subnet needs to communicate with a database in a private subnet. The database has no internet connectivity. Explain the routing and security group configuration that allows this." — this tests the kind of functional understanding that scenario questions require.
For CompTIA exams, flashcards targeting specific acronyms and protocol port numbers are legitimate because those details appear directly in exam questions. For AWS and Azure, cards should test decision-making ("Which storage class should you choose for data accessed once a month?") rather than pure definitions.
The closed-book write-out
After completing a study session, close all materials and write everything you can remember about the topic. Not an outline — a full explanation. Then compare what you wrote to your source material and note the gaps.
This technique produces intense discomfort in most candidates because the gaps are obvious and numerous, especially early in a study campaign. That discomfort is information. The gaps you expose in a closed-book write-out on day five are gaps that would have cost you on exam day if left uncovered.
Practice question drilling (done correctly)
Practice questions are active recall by definition — you are generating an answer, not recognizing one. But many candidates undermine this by using practice questions as passive review: they read the question, feel uncertain, look at the answer choices and the explanation together, nod, and move on. No actual retrieval has occurred.
Effective practice question drilling requires committing to an answer before reading the explanation. Even if you are 60% sure. Even if you get it wrong. The attempt — and the subsequent correction — is the learning event.
For CCNA practice sets, this means reading the question stem, covering the answer choices, writing or stating your answer, then uncovering the choices to select the closest match to what you said. This is significantly more effortful than reading question and choices simultaneously, which is why most candidates do not do it.
Mind dump before review
Before beginning a study session on a topic, spend five minutes writing everything you currently remember about that topic without looking at any materials. Then proceed with your study session. This pre-session retrieval attempt primes your memory for the incoming information and makes the new material stick faster.
Research by Kornell and Bjork (2007) showed that attempting to retrieve information before studying it — even when that retrieval mostly fails — significantly improves subsequent encoding of the correct information. The attempt creates a "preparation for future learning" effect.
The illusion of knowing on certification exams
The testing effect matters especially for certification candidates because exams create conditions where passive recognition is useless. The exam does not show you your notes and ask you to confirm that what you studied is correct. It shows you scenarios you have never seen and asks you to apply principles you studied.
This is why candidates who have watched every available video course and re-read their study guide multiple times still fail exams. They have high recognition. They can identify correct statements when they see them. But they cannot generate correct reasoning in novel scenarios, because their studying was passive.
A useful self-diagnostic: sit down with a blank sheet of paper and write the key concepts from one exam domain entirely from memory. For Security+, that might mean writing the main differences between IDS and IPS, the steps of the incident response lifecycle, and the key properties of each cryptographic algorithm — from memory, no notes.
Most candidates who believe they know a domain well discover they can write two or three paragraphs before running out of retrievable content. That ceiling is your true knowledge level, not the nodding feeling you had while re-reading.
Building an active recall study routine
A practical active recall routine for a six-week certification campaign:
| Day type | Activity | Duration |
|---|---|---|
| Study day | New content (video + notes) | 60 min |
| Study day | Active recall: closed-book write-out | 20 min |
| Review day | Anki card creation from previous session | 15 min |
| Review day | Anki card review (due cards only) | 20 min |
| Practice day | 50 practice questions, committed answers first | 60 min |
| Practice day | Missed question Feynman explanations | 30 min |
| Rest day | Optional: Anki review only | 10 min |
The ratio of active to passive study should increase as exam day approaches. In the final two weeks, active recall (practice questions, flashcard retrieval, closed-book write-outs) should account for 70-80% of your study time.
Why candidates resist active recall
The main resistance is emotional. Active recall surfaces what you do not know. Passive review confirms what you do know. Given a choice, most people prefer confirmation over confrontation.
There is also an effort mismatch: passive review is easier in the moment and feels productive, while active recall is harder in the moment and produces visible failures. The immediate feedback loop rewards passive review and punishes active recall — exactly backwards from what produces exam success.
Recognizing this tendency and deliberately choosing discomfort is a metacognitive skill. The candidates who score highest on difficult certification exams are typically those who have learned to treat wrong answers during study as useful data rather than failures to avoid.
See also: Retrieval Practice Techniques: The Most Effective Way to Study for Exams
References
- Roediger, H. L., & Karpicke, J. D. (2006). Test-enhanced learning: Taking memory tests improves long-term retention. Psychological Science, 17(3), 249-255.
- Brown, P. C., Roediger, H. L., & McDaniel, M. A. (2014). Make It Stick: The Science of Successful Learning. Belknap Press. ISBN: 978-0674729018.
- Bjork, R. A. (1994). Memory and metamemory considerations in the training of human beings. In J. Metcalfe & A. Shimamura (Eds.), Metacognition: Knowing About Knowing. MIT Press.
- Kornell, N., & Bjork, R. A. (2007). The promise and perils of self-regulated study. Psychonomic Bulletin & Review, 14(2), 219-224.
- Carey, B. (2014). How We Learn: The Surprising Truth About When, Where, and Why It Happens. Random House. ISBN: 978-0812993882.
- Dunlosky, J., Rawson, K. A., Marsh, E. J., Nathan, M. J., & Willingham, D. T. (2013). Improving students' learning with effective learning techniques. Psychological Science in the Public Interest, 14(1), 4-58.
- Adesope, O. O., Trevisan, D. A., & Sundararajan, N. (2017). Rethinking the use of tests: A meta-analysis of practice testing. Review of Educational Research, 87(3), 659-701.
Frequently Asked Questions
Why does re-reading notes feel productive but fail on exams?
Re-reading creates processing fluency — your brain recognizes the material and registers it as familiar. That familiarity feels like understanding. But exams require retrieval and application in novel scenarios, not recognition. Recognition is easy; production is hard. The gap between them is where most candidates fail despite extensive review.
What is the testing effect and why does it matter for certification prep?
The testing effect, also called retrieval practice effect, is the finding that actively retrieving information from memory strengthens that memory more than re-studying the same information. Every time you successfully answer a practice question from memory, you encode the underlying concept more deeply than you would by reading the answer. This is why high-volume practice question use, done correctly, is one of the most effective certification study strategies.
How do I use flashcards effectively for IT certification study?
Write question-answer pairs that test understanding and decision-making, not just definitions. For AWS exams, cards like 'Which storage class minimizes cost for data retrieved less than once a year?' are effective. Definitions of acronyms are useful only when those exact terms appear in questions, as they do on CompTIA exams. Use spaced repetition software like Anki to schedule reviews at optimally spaced intervals.
How much of my study time should be active recall vs content learning?
Early in a study campaign (first two weeks), 50-60% content learning and 40-50% active recall is reasonable. In the final two weeks before exam day, that ratio should flip: 70-80% of your time should be active recall — practice questions, flashcard retrieval, and closed-book write-outs. Spending the final week re-reading notes is one of the most common and costly mistakes candidates make.
I get discouraged when active recall shows how much I don't know. How do I handle that?
That discouragement is a sign the technique is working. Active recall exposes gaps; passive review hides them. The gaps you discover during study are gaps you fix before exam day. The gaps passive review hides are gaps that produce wrong answers under timed exam conditions. Reframe wrong answers during study as useful diagnostic data rather than performance failures.