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Get a hard quiz maker that turns your notes into tough questions

Upload your own PDFs, slides or notes and DeckOwl writes multiple-choice, true/false and short answer questions, each with an explanation of why the answer is right.

Create quizzes nowFree · No credit card required

Drop files here or browsePDF, DOCX, PPTX, text or photos of your notes · several files with Plus

Free account · 3 sets a month · Creates quizzes in seconds

Why a harder quiz teaches more

Easy practice tests tend to reward recognition, so they can feel productive while hiding the gaps you actually have. A hard quiz maker works best when it pulls questions from your own lecture slides and reading, because the tricky parts of your course are the ones worth testing.

Pull difficult questions straight from your own PDFs, slides and notes
Mix multiple-choice, true/false and short answer in one quiz
Read a short explanation for every question, right or wrong
Export to PDF or DOCX on Plus, or to QTI 2.1 and Moodle XML on Pro

Example hard biology quiz questions

Why does a competitive inhibitor raise the apparent Km of an enzyme without changing Vmax?It competes with substrate for the active site, so more substrate is needed to reach half-maximal speed. High substrate concentrations can outcompete the inhibitor, so Vmax stays the same.

In a cross of two heterozygous parents (Aa x Aa), what fraction of offspring are expected to be recessive homozygotes (aa)?1/4. Each parent passes the recessive allele a half the time, so the chance of aa is 1/2 × 1/2.

During which phase of mitosis do sister chromatids separate?Anaphase. Once the cohesin linking sister chromatids is cleaved, spindle fibers pull them toward opposite poles.

True or false: glycolysis takes place in the mitochondrial matrix.False. Glycolysis occurs in the cytoplasm, while the citric acid cycle takes place in the mitochondrial matrix.

Which organelles carry their own circular DNA and 70S ribosomes?Mitochondria, and chloroplasts in plant cells. Their bacteria-like DNA and ribosomes support the endosymbiotic origin of these organelles.

Generate the full set

Multiple-choice, true/false and short answer

Mix question types so you practice recognizing, choosing and writing answers, not just recognizing them.

Explanations for every question

Each answer comes with a short explanation, so a missed question teaches you the concept instead of just marking it wrong.

Built from your material

Questions come from the pages you upload, so the difficulty tracks your course rather than a generic question bank.

How it works

Upload your material

Add a PDF, DOCX, PPTX, text file or photos of pages. Images are read with text recognition.

Choose the question types

Pick multiple-choice, true/false or short answer, or combine them in one quiz.

Answer, then review

Take the quiz, read the explanation for each miss and study the concepts you keep getting wrong.

Hard questions are most useful when you attempt them before checking your notes. Answer from memory, read the explanation for every miss and come back to the questions you got wrong a day or two later. That spacing shows whether the answer is recalled or only recognized.

DeckOwl generates the questions and explanations from your uploads. You still decide what to study, which question types to use and when to test yourself again.

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Frequently asked questions

How should I study hard biology material so it sticks?

Answer questions from memory before rereading your notes, then read the explanation for every miss. Return to the questions you missed after a day or two so you practice recalling the answer rather than recognizing it.

How many questions should one practice quiz cover?

A focused quiz on a single topic usually works better than a long mixed one, because each explanation is easier to review while the material is fresh. Keep sessions short enough that you can finish and go over every miss.

Can I export hard quizzes to Word or Moodle?

Exports are paid features. PDF and DOCX export are included in Plus, and QTI 2.1 and Moodle XML export are available on Pro. The free plan lets you study in the browser without exports.

Is there a free plan for the quiz maker?

Yes. The free plan includes 3 generations per month and studying in the browser. No credit card is needed to start.

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Keep exploring the topic

Review the main ideas visually or practice recalling them.