When we learn we must concentrate. All of our attention must be on one thing. The ability to concentrate is not inherent. We first have to learn how to concentrate. This typically occurs in kindergarten or school. At the age of six, children can concentrate for about 15 minutes. Adolescents of 14 years can concentrate and work for twice as long. The concentration phase of adults lasts about 45 minutes. After a certain amount of time concentration dwindles. After which those studying lose interest in the material. They can also get tired or stressed. As a result, studying becomes more difficult. The memory can't retain the material as well. However, a person can increase their concentration! It's very important that you have slept enough before studying. A person who is tired can only concentrate for a short period of time. Our brain makes more mistakes when we're tired. Our emotions influence our concentration as well. A person who wants to learn efficiently should be in a neutral state of mind. Too many positive or negative emotions hinder learning success. Of course, a person can't always control his feelings. But you can try to ignore them when studying. A person who wants to be concentrated has to be motivated. We must always have a goal in mind when studying. Only then is our brain ready to concentrate. A quiet environment is also important for good concentration. And: You should drink a lot of water when studying; it keeps you awake. A person who keeps all this in mind will certainly stay concentrated for longer!