How to turn lectures and PDFs into exam notes: a 5-step workflow

A pile of slides, a 40-page PDF and a textbook chapter is not revision material. It's raw material. The skill is turning it into something short enough to revise from and active enough to learn from. Here's a workflow that does that, with or without AI.

Step 1: Decide what the notes are for

Notes for understanding a new topic look different from notes for last-week revision. For the first, keep explanations and examples. For the second, keep only definitions, formulae, steps, comparisons and the things you tend to forget.

A useful rule: your revision notes should be about a fifth of the length of the material they come from. If they're not much shorter than the source, they're a copy, not notes.

Step 2: Gather one topic at a time

Don't summarise a whole course in one go. Work chapter by chapter. If a PDF is large, split it first. Learnsable's PDF Toolkit can extract a page range right in your browser.

Text PDFs vs scanned pages

A PDF exported from a document or slide deck has real text, which any tool reads cleanly. A scan or phone photo of a page is an image, and small print or a skewed photo gives thinner results. Where you can, use the text version, or take a clear, well-lit, straight-on photo.

Step 3: Compress it, with structure

Ask for a structure, not just “a summary”: headings for each idea, then definitions, formulae, a worked example, and common errors under each.

Make exam notes from this chapter. Use headings. Under each, list the definitions, any formulae, one worked example, and the common mistakes. Keep it under two pages.

The notes generator does this from slides, PDFs, documents or photos, and also builds a mind map and flashcards from the same source.

From paragraph to note: an example

Say the source paragraph reads: “Osmosis is the net movement of water across a selectively permeable membrane from a region of higher water potential to a region of lower water potential, until equilibrium is reached.” Good notes keep what you'd need to answer a question:

• Osmosis: movement of water across a selectively permeable membrane, from higher to lower water potential, until equilibrium.
• Flashcard: “In which direction does water move in osmosis?” → “From higher to lower water potential, through a selectively permeable membrane.”
• Likely exam question: “Define osmosis” (2 marks) and “What happens to a cell placed in a more concentrated solution?”

Step 4: Turn the notes into questions

Notes you only read are passive. Convert them into questions: flashcards for terms and formulae, short-answer questions for ideas, a mock test for the whole chapter. With the PDF tool you can ask for practice questions straight from a document.

Step 5: Check the notes against the source

Summaries leave things out, and AI summaries can occasionally get a detail wrong. Before you rely on them, skim the original headings and ask: is anything my syllabus expects missing? A useful prompt:

Here are my notes and here is the chapter. What important points are in the chapter but missing from my notes?

Taking notes in the lecture itself

If you're writing notes live, the Cornell layout is a simple structure worth trying: draw a narrow column on the left for cue questions, a wide area on the right for notes, and a strip at the bottom for a two-sentence summary. After the lecture, fill the left column with questions the notes answer, and cover the right side to quiz yourself.

• Before: skim the slides or chapter headings for ten minutes, so the lecture has hooks to hang on.
• During: write ideas and examples, not sentences. Mark anything confusing with a question mark.
• After, within a day: tidy the notes, answer your question marks, and write the cue questions.

A few extra tips

• Make a one-page formula sheet for each subject and revise it daily in the final weeks.
• Photograph diagrams and label them from memory, then compare.
• Review on a schedule (day 1, 3, 7, 14) rather than rereading at random. See our guide to spaced repetition and active recall.
• Keep sources. Note where each idea came from so you can find it when something doesn't make sense.
• Export what you want to keep. Notes you can open anywhere, in PDF, Word or Markdown, are notes you'll actually use.