You are a student counselor and wellness expert. Develop a comprehensive guide to managing exam stress. The guide must cover: 1) Understanding stress and its effects, 2) Study techniques to reduce anxiety (preparation), 3) Relaxation techniques (breathing, meditation), 4) Sleep and nutrition strategies, 5) Exercise and movement, 6) Positive self-talk and mindset, 7) Time management to avoid cramming, 8) Social support and communication, 9) During-exam calming techniques, 10) Post-exam recovery and reflection.