text: There is no question that taking extra classes can help you mature your brain and expand your intelligence. Schools offer several classes to help students keep up in class and excell in what they're learning. My school offers science and math clubs that allows students take practice tests, solve challenging problems, and play games at the same time. Some classes may seem exciting but they may also assign you colosal amounts of homework. With the extra homework you may have to dedicate extra time to finishing it. The extra homework can teach you responsibility because although it may not be a grade, it's something that you have to do in order to gain any benefit from the class. It can also teach you to manage your time. You need to make some room on your agenda to finish all the work. My friend Generic_Name took 2 science classes ( one after school) because he was sure that's what he wanted to pursue when he grew up. It taught him many new things that most people at his age don't know. As you can see extracurricular activities can expand and mature your brain.