Science · Confirmed

SOF ISO — International Science Olympiad (formerly NSO)

Science Olympiad Foundation · Classes 1–12 · 2026–27 window: L1: 30 Oct / 19 Nov / 3 Dec 2026 · L2 Feb 2027

SOF's flagship science exam — note the 2026-27 rename from NSO to ISO.

Same structure as before the rename: subject section plus an Achievers section, 35–50 questions by class, one hour. Level 2 for Classes 3–12. If you see 'NSO' on older material, it is this exam.

Who is it for?

Students of Classes 1–12. Subject focus: Science. As with any olympiad, the best candidates are children who voluntarily enjoy the subject — an olympiad should stretch curiosity, not manufacture pressure.

Registration & source of record

Official information and registration: sofworld.org. Always verify the current date, fee and eligibility on the organiser's own site before paying — organisers occasionally shift windows, and this page is a directory entry, not the organiser.

Key facts — 2026–27

Status: Confirmed Window: L1: 30 Oct / 19 Nov / 3 Dec 2026 · L2 Feb 2027 Organiser: Science Olympiad Foundation Eligibility: Classes 1–12 Fee (approx): ₹170 (+ up to ₹30 school) Format: In-school, OMR · two-level Official site: sofworld.org

Last updated: 6 July 2026

Related Science exams

SilverZone iOS — International Olympiad of Science — expected · Oct – Dec 2026 (expected)
NSTSE — National Level Science Talent Search Exam — expected · School route: Dec 2026 · Online: Jan 2027 (expected)
Homi Bhabha Balvaidnyanik (HBBVS) — expected · Written: Sep 2026 (expected)
VVM — Vidyarthi Vigyan Manthan — expected · Oct – Nov 2026 (expected)

This is an independent directory entry compiled on uniform criteria. SOF ISO is a programme of Science Olympiad Foundation and is not conducted, prescribed, approved or endorsed by CBSE, NCERT, PARAKH or any government body.