Physics Sensei questions & answers
How Do I Stop Making Silly Mistakes on Exams?
You get the exam back and look at the points you lost. A minus sign that went missing. A number you copied wrong. Grams instead of kilograms. You knew how to do every one of them.
It’s maddening. Those points feel like they were stolen, not lost.
If you want to stop making silly mistakes on exams, here’s the good news: they’re not random. They follow patterns. And once you know your patterns, you can catch them.
What’s really going on
Silly mistakes feel like bad luck. But if you look at a few exams together, the same mistakes keep showing up. One student always drops minus signs. Another forgets to convert units. Another answers a different question than the one asked.
These mistakes happen when your head is doing too much at once: the physics, the math, and the clock. Something small slips through. And it tends to be the same small thing each time.
Why rushing makes it worse
Under time pressure, you skip writing steps and do more in your head. That saves a few seconds. But mistakes made in your head are invisible. There’s nothing on the paper to check.
When every step is written down, a wrong sign or a bad copy sits right there where you can spot it.
Why it’s hard to change
After an exam, most students look at the score, sigh, and move on. Looking at the mistakes feels bad. And calling them “silly” makes them sound unfixable, like they’ll just happen again no matter what.
But a mistake you’ve named is a mistake you can catch.
The fix: find your patterns, then check for them
You don’t need to be more careful about everything. You need to check for the two mistakes you make most.
Try this for your next three quizzes: the mistake log
- Every time you lose points, write down what happened in a few words: “dropped minus sign,” “forgot to change cm to m,” “answered for the wrong object.”
- After a few quizzes or homework sets, count them up. Which two show up the most? Those are your patterns.
- Make a short personal check for those two. For example: “Check every sign. Check every unit.”
- At the end of each problem, before you move on, ask: Does it make sense? Then run your personal check. It takes about 30 seconds.
- Keep writing every step on paper, even the easy ones. That’s what makes the check possible.
Your check is yours. It’s built from your own mistakes, so it catches the ones you actually make.
What changes
At first, the check feels slow. After a week or two, it becomes automatic, like checking your mirrors before you change lanes.
You’ll start catching mistakes on the paper before your professor does. Those are points you already earned, finally showing up in your score.
Silly mistakes aren’t silly. They’re patterns, and patterns can be caught.
Practice problems built for this
On Physics Sensei, every problem is solved step by step, and the last step is always “Does it make sense?” When you type an answer, the feedback names your exact slip, like a sign or a unit. That makes it easy to start your mistake log. Then you get one more like it, with new numbers, to practice your check.
Your next step: start your mistake log today with your last quiz. Then try one problem on Physics Sensei and run your personal check before you look at the steps.
More questions about studying and grades? See them all here.
Raul, Physics Sensei
