Watching is not studying

Watching videos and re-reading feel like hard work. But marks come from something else. This page explains the difference and shows the evidence. It also gives you a way to study that works when the exam is only weeks away.

Feeling you know it is not the same as scoring

You watch a clear explanation of torque on a bar magnet. Every step makes sense. You feel you know it. Three days later, the exam asks: derive the expression for the torque on a bar magnet in a uniform magnetic field. You cannot write anything. Or the steps come out in the wrong order, with a sign missing.

This is not your fault. This is how memory works. Understanding an explanation and writing it yourself are two separate skills. The exam tests only the second one. It never asks if you recognise something. It asks you to write it, on paper, in a fixed time.

What the research found

Scientists have studied this for over a hundred years, and the results agree again and again. Here are a few studies worth knowing:

• Re-reading and highlighting help very little. In 2013, John Dunlosky and his colleagues reviewed ten common study methods across hundreds of studies. They rated re-reading, highlighting and summarising as "low utility", which means of little use. They rated practice tests and spacing out study the highest.
• Testing yourself works better than reading again. In a study by Roediger and Karpicke (2006), some students read a passage again. Others took a test on it. A week later, the tested group remembered far more. Yet right after studying, the re-reading group felt more confident. Later, Karpicke and Blunt (2011) found that practising recall from memory worked better than even careful concept mapping.
• Feeling confident can fool you. Robert Bjork's lab showed that smooth, easy study creates an "illusion of competence". This means the easier the material feels, the more we overestimate what we can write ourselves. A good video is the smoothest, easiest material there is. That is exactly why it misleads you.
• Spacing and mixing work best. Cepeda and colleagues (2006), and Rohrer's work on interleaving, showed this. Coming back to a topic after a gap, and mixing different types of problems, feels slower. But the learning lasts much longer than one long block on a single topic.

In short: the methods that feel best (watching, re-reading, highlighting) work worst. The methods that feel hardest (writing answers from memory, checking them, coming back later) work best. The difficulty is what makes them work.

Why videos mislead you

• A video starts from the basics. You already studied them in school. So most of the time goes on what you already know.
• Your attention wanders, and you do not notice when it happens. The video ends and it feels like the work is done.
• You write nothing. In the exam, you write everything.
• You get no score. Afterwards, you cannot tell what you can do and what you cannot.
• It is pleasant, so it takes the place of the harder work that would really raise your marks.

This does not mean videos are useless. A video is a tool to clear a doubt on one specific point. It is not a way to cover a chapter.

What counts as practice

Practice is anything that gives you an answer you can check. The test is simple: did you end up with written work and a score?

• Solving exercise questions on paper, then marking them with the answer key.
• Writing a derivation from memory, then checking it against the textbook line by line.
• Drawing a labelled diagram from memory.
• Attempting one section of a past paper in a fixed time, then marking it with the marking scheme.
• Explaining a topic to someone else, out loud, without notes.

Reading the textbook gets you ready for practice. It is not practice. Watching a video gets you ready for practice. It is not practice either. You can do both. But they are not the day's work.

"Do every exercise" is a plan nobody can keep

If the goal is everything, one missed day makes the goal look impossible, and the plan is dropped. A plan lasts only when "done" has a clear end. It must be written down, and possible in the hours you really have. So decide what "done" means.

Have I studied today? A ten-second check

• Is there paper with my working on it? If not, I have not studied yet.
• Is there a score, or a derivation ticked against the book? If not, I do not know what I learned.
• Did I spend more time watching than writing? Then tomorrow I start with writing.

How to use a video well

1. Attempt the question or derivation first. Keep trying until you are really stuck.
2. Watch only the part that clears your doubt. Use 1.5x speed if it starts from the beginning.
3. Close the video and finish the attempt from memory.
4. Write down where you got stuck. It is a weak spot. Revise it again in a week.

Revision later is where marks are made

A chapter marked done still needs revision. Two weeks later, answer five questions from it before you start the day's work. This takes five minutes. If you get three wrong, add one hour on that chapter to your study board. This is spaced revision from memory. In the last three months, it is the habit that costs the least time and gives the most marks.

Next: the coaching module and the board exam test different things.