Your GitHub Student Developer Pack benefits do not extend to other accounts, such as organizations. Students are also not eligible for academic discounts on organizations for a Team subscription. However, mentors of FIRST Robotics teams can apply for an organizational discount on behalf of their students, as well as teachers.
Your teacher can apply for an organizational discount on your behalf for your team to collaborate on projects.
Instead of an organizational discount, you can also invite your teammates to collaborate within repositories on your personal account.