Speaking up in class doesn't just display your intelligence about the course; it also makes your face become known in the classroom. Those who speak up tend to find themselves as the most liked person in the room. Your intelligence and confidence to answer questions your professor has are important for your grades, mental health, and social skills.
It doesn't always mean the loudest person in the room is the smartest, but it does mean they're more than likely the most confident. People admire confidence: Think of your favorite actor/actress. Besides their physical looks, one of the top compliments he/she is given is admiration for their confidence. Confidence attracts people romantically and in friendships.
One of the first friends I met at Mount St. Mary’s was exactly like this. She is most certainly the loudest person in the room and even if she doesn't always have the right answer in class, her confidence and conviction are incredible. This instantly made her one of the more well-known faces in the classroom and instantly increased her chances of people wanting to speak to her.
If you are book smart on top of having confidence, then many people will rely on your opinions, especially on topics related to class. You’ll more than likely get questions after about homework, studying, etc. Why wouldn't someone ask “the smartest kid in class” about what to do for homework and if they want to study together? These moments are perfect opportunities for you to grow these interactions into friendships.
Speaking up in class finally is just important for yourself. You will have an opportunity to know if the thought in your head is correct and build your relationship with your professor. Yes, it is a great way to grow socially, but it's important for just growing. Becoming the greatest version of yourself will always attract like-minded people and those are the friendships that will last you a lifetime.