Pooled Knowledge - Bringing together a group of people with different pools of knowledge will nearly always result in valuable exchanges of information and study techniques.
Teaching Others - Teaching is a great way to clarify what you already know. If you are able to help other members of the group, you will reinforce your own knowledge along the way, too.
Staying Accountable - Oftentimes members of a study group set group goals and study assignments in between sessions. When this happens, members of the group help to hold one another accountable for what they’ve committed to learning.
Distraction - Sometimes, students choose to study with their friends. In this case, it can be easy to get off track discussing social events, school, or other irrelevant topics.
Varying Levels of Proficiency - SAT study groups can sometimes be ineffective when their members arrive with broadly varying levels of knowledge or preparation.
Scheduling - Scheduling can be tricky anytime you try to organize a group of busy high schoolers. If more time is spent trying to get together than is actually spent studying, you won’t come out on top.