Writers 
Have you ever spent hours studying and felt confident that you understood everything, only to sit down for a test and realize that you can barely remember what you read?
I have experienced this before.
I used to think I was studying well because I was spending time with my books. But eventually, I realized that there was a difference between studying and cramming.
Sometimes, I wasn't really learning the material. I was simply trying to get as much information into my head as possible before I needed it.
Reading Something Again and Again Doesn't Always Mean You Understand It
When we read something repeatedly, the words can start to look familiar.
You might read a definition five times and think, “I know this already.”
But recognizing something when you see it is not necessarily the same as being able to explain it yourself.
This is why simply reading the same notes over and over may not be enough.
Understanding requires more than familiarity. You need to be able to connect the idea to what you already know, explain it and use it.
Long Hours Don't Always Mean Good Studying
Another mistake students make is believing that the number of hours they spend studying automatically determines how much they have learned.
Someone can sit with a textbook for six hours and still understand very little.
Another person might spend two focused hours understanding the basics, asking questions and testing themselves, and remember much more.
The important question shouldn't only be:
“How long did I study?”
It should also be:
“What did I actually understand?”
Spending more time studying can be useful, but only when that time is being used effectively.
Use the 80/20 Principle
This is where the 80/20 principle, also known as the Pareto principle, can be useful.
The basic idea is that a relatively small number of things can sometimes contribute to a large portion of the results.
When studying, this can remind us that not every piece of information has the same importance.
Instead of treating every sentence as equally important, identify the major concepts and foundational ideas first.
For example, if you are studying a complicated topic, understanding a few key principles may make many of the smaller details much easier to understand later.
However, the 80/20 principle doesn't mean you should study only 20% of your material. Especially when preparing for an exam, you still need to know what your course requires.
It is better used as a way to prioritize: understand the most important concepts first, then build on them.
Understanding the Basics Comes First
When I study, I've learned that I shouldn't rush through a topic just because I want to finish it.
Sometimes, we are so focused on covering many pages that we don't stop to make sure we understand the foundation.
But if you don't understand the basics, the more complicated parts can become even more confusing.
So instead of rushing to finish a chapter, take your time with the fundamental concepts.
Ask yourself:
What does this actually mean?
Can I explain it in my own words?
How does this connect to what I already know?
Can I give an example?
Those questions can make studying more active instead of simply staring at words on a page.
Teach What You Have Learned
One study method that has helped me is discussion and teaching.
After studying something, try explaining it to another person as though you are the teacher.
You don't need a classroom or even a serious audience. You can discuss the topic with a friend or simply explain it aloud to yourself.
This can reveal the parts you actually understand and the parts you only thought you understood.
If you can't explain an idea simply, that may be a sign that you need to go back and study it again.
Don't Rush to Finish. Learn to Understand.
If you are someone who reads for hours but feels like nothing stays in your head, don't immediately conclude that you are bad at learning.
You may simply need to change how you study.
Don't rush through your materials just so you can say you've finished them.
Spend more time understanding the basics. Identify the important concepts. Discuss what you've learned. And, most importantly, teach someone else.
Studying isn't a competition to see who can read the most pages or spend the longest hours with a book.
The goal is to learn something well enough that you can remember it, explain it and use it.
Don't just study harder. Study with purpose, understand the important things, and make what you learn useful.