Consider the idea that competition is not necessary for success in school. In some cases, competition actually works against your success. It is often stressful. It can strain relationships. What's more, competition can be inefficient.
People can get more done by sharing their skills and resources than by working alone.
We are social animals, and we draw strength from groups. Study groups feed you energy. Aside from the camaraderie, the fellowship, and the fun, study groups elevate your spirit on days when you just don't want to work at your education. You are more likely to keep an appointment to study with a group than to study by yourself. If you skip the solo study session, no one may know.