The student who writes the most in class is rarely the one who learns the most. Trying to capture a lecture word for word means you cannot listen while you write; the notebook fills and the memory stays empty. A good note is a summary of the class, not a recording of it.
Whether note-taking worked is decided after class, not during it. A notebook that is never opened again was wasted effort, however neat it looks.
Why not write everything down?
Because writing forces selection, and the learning happens in the selection. Transcribing what you hear is mentally easy; deciding "which part of this matters" is hard, and that difficulty is what fixes the material.
A practical measure: if you can write a sentence in your own words, you understood it. The places where you had to copy verbatim are the places you did not, so marking them with a question mark also builds the list of things to ask afterwards.
One exception: definitions, formulas, dates and direct quotations go down exactly as given. Those do not need selection, they need accuracy.
How does the Cornell layout work?
The page is split into three. A narrow strip on the left, a wide area on the right, a band of three or four lines at the bottom. During class you write only in the wide area: points, short sentences, examples. The strip and the band are filled in afterwards.
In the left strip you write the questions your notes answer. Next to a note on the water cycle goes "why does evaporation speed up when". In the bottom band you summarise the whole page in two sentences. That is where the value sits: when you revise, you cover the right side and try to answer the questions on the left, so the notebook becomes a test of itself.
This replaces revision by rereading with revision by recalling, and the difference between those two is large. Spaced repetition and active recall covers why.
Why do the five minutes after class matter?
Because the gaps in your notes can only be filled while you still remember the class. Going back to the page before you have forgotten, finishing half-written sentences, expanding abbreviations and writing the left-hand questions takes five minutes. The same job in the evening takes twenty, and some of the gaps can no longer be filled at all.
In university lectures this decides everything. In a class delivered from slides, the notes are made of what is not on the slides: the example the lecturer gave, the analogy used to explain a concept, the point they called important. Downloading the deck is not note-taking.
Laptop or paper?
Whichever one forces you to choose. Typing is fast, and that speed makes transcription possible, which removes the need to select. Writing by hand is slow, and the slowness pushes you into summarising. That is paper's real advantage.
A laptop has genuine benefits though: searching, reorganising, adding images. A sensible mix is paper in class and a digital summary in the five minutes after, where the second step doubles as the first revision.
If you do take notes on a screen, keep one rule: only that window open. Switching tabs while listening costs you half the lecture and half the notes, and what multitasking really costs sets out why.
How do you turn notes into exam practice?
By converting them into questions. Reading the notebook from start to finish is the most common and least effective method, because what you read feels familiar and familiarity passes for knowledge. Instead, copy the left-strip questions onto one sheet, close the notebook and answer them.
A three-day routine works well: day one, build the question list from your notes; day two, try to answer them and mark the ones that failed; day three, study only the marked ones. Those three days hold better than three readings of the same pages.
If the exam asks for written answers, add one step and answer in full sentences. Our guide to answering open-ended questions covers how those answers are built and scored.
Should every subject use the same format?
No, and forcing it is a waste. In maths, a note means a worked example: write the method the teacher built on the board step by step, and note in the margin why each step was taken. Writing out the theory rarely helps here.
In history and literature, record relationships rather than events. The dates are in the book; your notebook exists to hold "this followed from that". In science subjects the equivalent is mechanism, and arrows showing the order of a process beat paragraphs.
In language classes notes run as lists of words and phrases, and how to memorise vocabulary covers how to drill them.
Is borrowing someone's notes useful?
If you missed the class, yes. If you were there, no. Someone else's notes are built from someone else's choices: what they skipped may be your gap, and what they thought important may already be solid for you.
Comparing notes is a different matter and genuinely useful. Putting two sets side by side shows what both of you missed, which tends to be one of the likeliest things to appear on the exam.