Tonic timing for exam students: ① ideal: 3–6 months before exam (March–August for college entrance exam students), ② realistic: 1–2 months before exam, ③ short-term: 2–4 weeks before exam (for fatigue and concentration). Reasons for early start: ① constitutional improvement takes time, ② fatigue accumulation prevention, ③ side effect adjustment time. Most college entrance exam students start in March, with seasonal variation possible. Continued dose throughout the year is most ideal.