How Does Spaced Repetition Build Long-Term NCLEX Retention?
How Does Spaced Repetition Build Long-Term NCLEX Retention?" description: "Students using spaced repetition recalled 61% of material after one week vs. 40% with re-reading. Here's how to apply it to your NCLEX prep.
How Does Spaced Repetition Build Long-Term NCLEX® Retention?
You spend years learning pharmacology, pathophysiology, and clinical reasoning. Then you sit for NCLEX® and a lot of it has quietly slipped away. Without a review plan, that's what happens.
Research from Advances in Health Sciences Education found that students retain roughly 65-75% of basic science knowledge after one year, dropping to about 50% by year two when that knowledge goes unused (Custers, 2010). Half your coursework, gone.
Spaced repetition is the best-studied fix for that. Below is why it works, what the research says, and how to fit it into your NCLEX® prep this week. If you're mapping out your NCLEX® 2026 study strategy, start here.
Short version: A 2026 meta-analysis in The Clinical Teacher found a medium-to-large effect (SMD 0.78) for spaced repetition on knowledge retention across 21,415 medical learners (Maye & Hurley, 2026). Skip the cram. Review at increasing intervals.
What Is the Forgetting Curve and Why Should You Care?
Within 31 days of learning something new, you retain only about 21% of it without any review, according to a replication of the Ebbinghaus forgetting curve published in PLOS ONE (Murre & Dros, 2015). The drop-off is steepest in the first hour, when retention falls from 100% to roughly 44%.
This isn't abstract for nursing students. The pharmacology you learned in September could be mostly gone by December if you never went back to it. NCLEX® will still test you on it.
Each review at the right interval resets the curve, and the memory lasts longer than it did before. That's spaced repetition. You skip the one long marathon and spread short reviews across days and weeks.
You probably still know how to calculate a drip rate, even though you learned it semesters ago. You've used it over and over in clinicals. Spaced repetition gives you that same repeat exposure on purpose, for everything else.
How Does Spaced Repetition Perform in Medical Education?
A 2026 systematic review of 13 studies covering 21,415 learners found that spaced repetition produced an SMD of 0.78 compared to standard studying in medical education (Maye & Hurley, 2026). That's a medium-to-large effect, and it held up across different kinds of medical content and learners.
This wasn't one classroom experiment. It pooled thousands of learners across multiple countries and specialties, studying everything from anatomy to pharmacology to clinical reasoning. Spaced repetition improved retention in all of it.
A separate study of 26,258 practicing family physicians found similar results. Doctors using spaced repetition scored 58% on knowledge assessments versus 43% for the control group (Price et al., 2025). Those who completed double repetitions scored even higher at 62%. If it works for physicians years into their careers, it should work for you in nursing school.
Does Testing Yourself Work Better Than Re-Reading Notes?
Students who tested themselves repeatedly recalled 61% of material after one week, compared to just 40% for students who only re-read their notes (Roediger & Karpicke, 2006). That's over 50% more retention for the same study time. The only change was quizzing instead of re-reading.
Researchers call this the "testing effect." It's one of only two strategies rated "high utility" in a review of 10 common learning techniques (Dunlosky et al., 2013). The other is distributed practice, which just means spacing your study sessions over time.
Put those two together and you get testing yourself at spaced intervals.
Highlighting your textbook was rated low utility. So was re-reading notes the night before an exam. Those are the habits most nursing students fall back on, and they fit badly with the NCLEX® 2026 test plan, which tests clinical judgment more than recall.
How Do You Build a Spaced Repetition Schedule for NCLEX®?
A meta-analysis of 839 assessments across 317 experiments confirmed that distributed practice outperforms massed practice for long-term retention (Cepeda et al., 2006). Here's a schedule based on that research, sized for a nursing student's workload.
Step 1: Learn the material first
Read your notes, watch the lecture, work through the content. Don't jump straight to practice questions. Retrieval practice needs something to retrieve.
Step 2: Review within 24 hours
The curve drops fastest on day one. Do a quick review, or answer 10-15 practice questions on the topic within 24 hours.
Step 3: Review again at Day 3
Some concepts will have stuck and others will feel fuzzy. Spend your time on the fuzzy ones. Adaptive practice questions help here because they keep pulling you back to what you're missing.
Step 4: Review at Day 7
A week out, test yourself again. If you can still recall it, it's heading into long-term memory. In the Roediger & Karpicke study, students who used repeated testing retained 61% at exactly this interval.
Step 5: Review at Day 14 and Day 30
The longer gaps build durability. You're studying for NCLEX®, which might be months away, not just next week's exam.
Tip: The schedule is easy. Resisting the night-before cram is the hard part. Trust the intervals and a little practice each day, and exams feel less frantic.
What Makes Daily Practice More Effective Than Cramming?
A 2024 systematic review found that 68% of experiments in health professions education (43 out of 63) showed significant benefits from distributed practice or retrieval practice compared to controls (PMC, 2024). So would you swap one 3-hour cram session for six 30-minute sessions across a week? The research favors the six.
Even five questions a day gives your brain repeated chances to pull the information back up. If you want a low-effort way to build the habit, Lily Daily gives you one NCLEX®-style question per day.
NCLEX® first-time pass rates for US-educated students dropped from 91.2% in 2024 to 86.7% in 2025 (NCSBN, 2026). Retaining what you learned in school is one of the things you can control. Spaced repetition is a way to do that.
Frequently Asked Questions
How long does it take for spaced repetition to show results?
The Roediger & Karpicke study showed a clear difference at the 7-day mark, with testing-group students remembering 61% versus 40% for the re-reading group (Roediger & Karpicke, 2006). Give it at least two weeks before you judge whether it's working.
Can I use spaced repetition for all NCLEX® topics?
Yes. The 2026 meta-analysis covered subjects including anatomy, pharmacology, and clinical reasoning, and found benefits across content types with an SMD of 0.78 (Maye & Hurley, 2026). It works especially well for fact-heavy topics like medications and lab values.
Should I keep using spaced repetition after graduation?
Practicing physicians who used spaced repetition scored 58% on knowledge assessments compared to 43% for non-users, according to a 2025 study of 26,258 family doctors (Price et al., 2025). Spaced review keeps paying off after graduation.
Does spaced repetition replace normal studying?
No. You still have to read, go to lectures, and work through clinical content first. Spaced repetition is the review that comes after. It keeps a skill sharp once you've learned it.
How many questions should I practice per day for NCLEX®?
There's no magic number, but the research favors steady daily practice over big sporadic sessions. A review of 317 experiments confirmed that distributed practice outperforms massed practice for retention (Cepeda et al., 2006). Even 10-15 questions per day, spaced across your weak topics, builds more durable knowledge than 100 questions in one sitting.
Start Building Retention Now
Spaced repetition and active recall are the two strategies the research rates highest, and NCLEX® prep asks you to hold a huge amount of clinical knowledge for months. Here's where to start:
- This week: Pick one topic from your current coursework and review it using the Day 1, 3, 7, 14, 30 schedule above
- Build a daily habit: Answer at least 5 NCLEX®-style questions per day to keep the forgetting curve in check
- Check the test plan: Read what's changing on NCLEX® in 2026 so you're studying the right material
- Get a longer plan: Our NCLEX® 2026 study guide lays out a full prep strategy built on spaced repetition
About the Author: Harrison is the founder of Study With Lily, an NCLEX® prep platform built for the 2026 test plan. After watching his wife and her classmates struggle with the gap between coursework and boards prep, he built Lily to close it.