How to Turn a PDF Into a Practice Test: 3 Ways (Free and With AI)

Rereading your notes feels productive. The words look familiar, the highlights make sense, and you finish with a pleasant sense of having covered the material. The problem is that familiarity isn't memory — and the exam won't show you your notes.

The fix is to test yourself. And the fastest way to do that is to turn the material you already have — lecture notes, slides, a textbook PDF — into a practice test.

This guide covers why it works, three ways to do it (from free and manual to AI), and how to make sure the questions are actually good.

Why practice tests beat rereading

Pulling information out of your memory strengthens it far more than putting it in again. Psychologists call this the testing effect, or retrieval practice.

In a well-known 2006 study by Henry Roediger and Jeffrey Karpicke, students read short prose passages and then either reread them or took a recall test with no feedback. After five minutes, rereading looked slightly better. But after two days and after a week, the students who had tested themselves remembered substantially more.

A follow-up in Science (Karpicke & Roediger, 2008) went further: once students had learned a set of word pairs, continuing to test them produced much better recall a week later, while continuing to study them added almost nothing.

When Dunlosky and colleagues (2013) reviewed ten common study techniques, practice testing was one of only two rated "high utility". Rereading and highlighting were rated low.

Method 1: Write your own questions (free, slow, effective)

Writing questions is a study session in itself: to write a good question you have to decide what matters and understand it well enough to test it.

How to do it

1. Work one section at a time. Read a page or a slide, then close it.
2. Write questions in the margin or in a separate document. Turn headings into questions ("What are the three stages of mitosis?"), definitions into fill-in-the-blanks, and comparisons into "what's the difference between X and Y?".
3. Use the Cornell layout if you take notes by hand: a narrow left column for questions, the notes on the right. To test yourself, cover the right side and answer from the left.
4. Write the answer and the page number. You'll need the page when you get one wrong.
5. Answer the questions on a later day, not straight after writing them.

Good for: deep understanding, subjects where you need to decide what's important. Drawback: slow. A 40-page chapter can take hours, which is why most students stop doing it.

Method 2: Use a general AI chatbot (fast, needs checking)

A general-purpose AI chatbot can turn pasted text or an uploaded PDF into questions in seconds. A prompt like this works well:

Using only the text below, write 15 multiple-choice questions that test understanding rather than recall of single words. Give four options each, with plausible wrong answers. After each question, give the correct answer, a one-sentence explanation, and the page or section it comes from.

Tips:

• Say "using only the text", or the chatbot may add facts from its general training that aren't on your syllabus — or are simply wrong.
• Ask for the source of each question. Questions you can't trace back are questions you can't check.
• Ask for a mix of types — some fill-in-the-blank or short answer as well as multiple choice.

Drawbacks: you have to copy everything into a document, mark your own answers, and remember to come back to the questions later. Long PDFs may be cut short or summarised. And nothing keeps track of which questions you got wrong.

Method 3: Use a study app built for it (fast, tracked, scheduled)

Dedicated study tools do the same generation but keep everything after it: your answers, your mistakes, and when to see each question again. That's the part that turns one practice test into lasting memory.

Here's how it works in DeepRevision:

1. Upload your material. A PDF, slides, Word file, photos of notes, a recorded lecture or a YouTube link — one chapter or a whole textbook. Scanned pages are read too.
2. Choose what to cover. The whole document, a page range, or just the passages you highlighted.
3. Pick question types. Multiple choice, true or false, fill in the blanks, matching, flashcards — or image labelling for diagrams.
4. Practise or sit it as an exam. Practice mode explains each answer as you go; exam mode is timed and silent, and marked at the end.
5. Every question links back to its page, so you can check any question against the source in one tap.
6. Wrong answers are kept and sorted by topic, and every question is scheduled for review with FSRS, so it comes back right before you'd forget it.

Comparing the three methods

How to check that AI-written questions are good

Whatever tool you use, a bad question teaches you the wrong thing. Spend a minute checking:

• Is it answerable from your material? If not, it may be testing something off-syllabus — or invented.
• Does it test an idea, not a word? "Which structure carries signals away from the cell body?" beats "Fill in: the ___ is long."
• Are the wrong options plausible? If one option is obviously silly, it's a 1-in-3 question, not 1-in-4.
• Is there exactly one right answer? Watch for "all of the above" traps and options that are both partly true.
• Can you find the page? If you get it wrong, the page is where the learning happens.

Make the test count: answer it more than once

A single round of practice questions is the beginning, not the end. The biggest gains come when you answer the same questions again on later days, at growing gaps — the idea behind spaced repetition.

And the questions you get wrong are the most valuable of all. Log them, find out why, and retry them until you get them right on a later day without help. Our guide to learning from your mistakes before an exam walks through a simple system for doing exactly that.