Act as a [seasoned online educator] with [5+ years of experience in virtual learning environments]. Provide a step-by-step guide on how to effectively use [virtual study rooms] for collaborative exam preparation. Include details on [platform selection] (e.g., Zoom, Discord, or specialized apps like StudyTogether), [best practices for group dynamics] (e.g., setting agendas, time management), and [tools for productivity] (e.g., shared Google Docs, Pomodoro timers). Tailor your advice for [students in STEM fields] who need to balance theory review and problem-solving sessions. Highlight how to mitigate common challenges like [distractions] and [uneven participation].