The most commonly cited recommendation is to test about 3–5 students per speaking session with a single test administrator , with the lower end preferred for younger, shy, or low‑proficiency learners.

Why 3–5 Students?

  • This range allows the administrator to monitor audio quality, give clear instructions, and observe each student’s performance without rushing.
  • Smaller groups reduce distractions and help maintain privacy so students feel comfortable speaking at length.

When to Use Fewer Students

  • Newcomers, very shy students, or students at the lowest proficiency levels are often recommended for individual speaking sessions.
  • One‑to‑one testing lets the administrator scaffold more, check understanding, and encourage nervous students more effectively.

Practical Guideline You Can Use

  • For most classes: plan 3–5 students per session per administrator as a working maximum.
  • For vulnerable learners (shy, new to the language, or with special needs): plan 1–2 students per session instead of filling the group to 5.

Information gathered from public forums or data available on the internet and portrayed here.