How to study from lecture slides (and remember it)
To study from lecture slides, don’t reread them. Fill in the explanation behind each shorthand bullet, turn the key slides into questions, focus on the slides that carry the core concepts, and then test yourself with the deck closed. Slides tell you what to study. Answering questions from memory is how you learn it.
Slides are a strange study tool. They were built to support a lecture, so on their own they’re a pile of half-sentences and diagrams missing the part where the professor explained what any of it meant. Rereading forty of them the night before an exam feels productive. Mostly it makes the slides look familiar, and your brain happily mistakes familiar for known.
Why rereading lecture slides doesn’t work
Dunlosky and colleagues’ 2013 review of ten common learning techniques rated rereading and highlighting as low utility. Practice testing and spacing your study over time came out on top. The reason is simple enough: an exam asks you to produce an answer, and rereading only trains you to recognize one.
Slides make this worse than a textbook does, because there’s so little on each one. You can “get through” a 40-slide intro psych deck in fifteen minutes and feel finished. Then the exam asks you to explain why the bystander effect happens, and the slide only said “Diffusion of responsibility (Darley & Latané).”
Step 1: Fill in the gaps behind each bullet
A bullet that says ”→ leads to depolarization” meant something when the professor said it. A week later it’s a riddle. Go through the deck and, for each content slide, write the full sentence the bullet is shorthand for. Write it in the slide’s notes field, in the margin of a printout, or in a separate doc.
If you can’t write that sentence, you’ve found a gap. That’s useful information, and it’s much better to find it now than in the exam room.
To fill the blanks, use whatever context you have:
- The lecture recording, if your course posts one. Skip to the timestamp for the confusing slide instead of rewatching the whole thing.
- The assigned textbook section. Slides often follow the textbook’s order, so the matching section is easy to find.
- A classmate’s notes, especially for the parts the professor said out loud and never put on a slide.
If you take notes during lectures, the best ones capture what isn’t on the slides. There’s more on that in note-taking methods worth your time.
Step 2: Turn lecture slides into questions
Slides list answers. Studying works better in reverse. Take each important slide and turn it into a question you’d want to answer cold.
- “Three types of muscle tissue” becomes “What are the three types of muscle tissue, and how do they differ?”
- A Calc II slide titled “Integration by parts” becomes “When would you choose integration by parts over substitution? Work one example.”
- A history survey slide listing causes of World War I becomes “Explain how the alliance system turned a regional crisis into a continental war.”
Notice that the better questions ask for explanation or application, not just a list. If your exam has essay or problem questions, your practice questions should look like that too.
Step 3: Find the slides that matter most
Forty slides don’t deserve forty equal minutes. Some are title slides, some are a single stock photo, and a handful hold the entire point of the lecture. Mark the load-bearing slides:
- Definitions and key terms (especially anything bolded or repeated)
- Processes and mechanisms, like a reaction mechanism in organic chemistry
- Comparisons and tables
- Worked examples and diagrams
- Anything the professor said “will be on the exam” (people forget to write this down, and it’s the most valuable line of the lecture)
Spend most of your time there. This kind of triage is one of the fastest wins available, because you stop pouring effort into slides that were never going to be tested.
Step 4: Turn the slides into flashcards and a practice quiz
Once you have questions, put them somewhere you can drill them. Flashcards work well for definitions, structures and short facts. A practice quiz works better for application and multi-step problems. One idea per card, in your professor’s wording, beats a card that tries to cram a whole slide onto the back. If you’re working from a slide PDF, our guide on how to make flashcards from a PDF walks through it in more detail.
This is the step that’s tedious by hand, which is why so many students skip it and go back to rereading. If you’re short on time, building cards for only the load-bearing slides is still far better than building none.
How MyStudySidekick handles this step
Import the slide PDF into MyStudySidekick and it generates a flashcard deck, a quiz and a summary that fills in the connective tissue the bullets left out. If you recorded the lecture, import that alongside the slides. Because it reads your actual deck, the cards match your professor’s wording and emphasis, and they stream in live so you can start studying almost immediately. When a slide still doesn’t make sense, you can ask your sidekick, and it explains that slide using your own material rather than a generic web answer that may frame the topic differently from your course.
Step 5: Close the slides and test yourself
The most important step is the one people skip. Once you’ve built questions and cards, study from those, not the slides. Looking at a slide you’ve seen ten times feels like learning because it’s familiar. Recognizing a slide isn’t the skill the exam tests. Pulling the idea out of your head onto a blank page is.
Roediger and Karpicke’s 2006 experiments showed this clearly: students who practiced recalling a passage remembered more a week later than students who spent the same time restudying it, even though the restudy group felt more confident. That discomfort of reaching for an answer is where the learning happens. For more on why, see how to study smarter with active recall.
Common mistakes when studying from slides
- Rereading the deck and calling it studying. If you’re not answering questions, you’re not testing yourself.
- Giving every slide equal time. Title slides and stock images don’t earn your attention.
- Leaving shorthand bullets undecoded. ”→ depolarization” is a riddle you’ll fail to solve under exam pressure. Write the full sentence while you can still reconstruct it.
- Copying slide text during the lecture. You’ll get the slides anyway. Write down what the professor adds.
- Skipping the slides you don’t understand. A confusing slide is where the exam gaps hide. Ask about it.
A weekly slide routine for any course
- Same day as the lecture: decode the shorthand bullets and turn the load-bearing slides into questions or cards while the lecture is still fresh.
- Two or three days later: answer every question with the slides closed. Mark the ones you miss.
- Each week after: run a short spaced-repetition session on the cards. Missed cards come back sooner; easy ones fade out.
- Before the exam: take a practice quiz under timed conditions and review only what you get wrong.
Do this for each lecture as it happens and you won’t face a 300-slide pile the week before finals.
Have a slide deck sitting in your downloads? Turn it into flashcards with MyStudySidekick.
Frequently asked questions
Is it enough to just study the lecture slides for an exam?
Usually not on their own. Slides are an outline of what the professor said, so they leave out explanations, worked steps and the connections between ideas. They are a good map of what will be tested, though. Use them to decide what to study, fill the gaps from the textbook or recording, then practice with questions rather than rereading the deck.
How do I take notes on lecture slides?
Print or download the slides before class and annotate them during the lecture instead of copying the bullet text. Write down what the professor adds: examples, reasons, warnings about common mistakes and anything they say will be on the exam. After class, rewrite any shorthand bullet as a full sentence while you still remember what it meant.
How do you turn lecture slides into flashcards?
Pick the slides that hold definitions, processes, comparisons and worked examples. Turn each key point into a question with a short answer, such as "What triggers depolarization in a neuron?" Keep one idea per card, use your professor’s wording, and include diagram cards where the figure matters. Skip title slides and decorative images entirely.
How long should it take to study one lecture’s slides?
For a typical 50-minute lecture with 30 to 40 slides, plan about 45 to 60 minutes the first time: roughly half filling in gaps and making questions, half answering them from memory. Later review sessions should be much shorter, often 10 to 15 minutes, because you are only working through the cards and questions you already built.