SOF ISO 2026-27 (International Science Olympiad) is conducted by Science Olympiad Foundation (SOF) for students of Class 1 to 12. The exam is held on 3 dates: Exam date – 30 October 2026; Exam date – 19 November 2026; Exam date – 3 December 2026. The next one is on 30 October 2026. Registration is open. It is also called International Science Olympiad (formerly SOF NSO, National Science Olympiad) or sofworld.org/nso redirects to /iso.
SOF ISO 2026-27
This page covers SOF ISO 2026-27 dates, how to apply, eligibility, the exam pattern, awards and official links.
| Full name | International Science Olympiad |
| Conducted by | Science Olympiad Foundation (SOF) |
| Classes | 1 to 12 |
| Mode | Offline (pen-paper, objective MCQ); Level 1 at the student’s own school during school hours, Level 2 at a centre finalised by SOF |
| Levels | Level 1: All registered students of Classes 1 to 12 (through their school; a school must register at least 10 students); Level 2: Level 1 qualifiers of Classes 3 to 12 (Classes 1-2 are ranked on Level 1 only) |
| Duration | 60 minutes (Level 1) |
| Language | English |
| Fee | Rs 170 (incl. GST) per student per Olympiad, paid by the school to SOF (India, Bhutan, Nepal); the school may collect Rs 30 more, so students pay Rs 200 at school. No fee for students with a major physical disability or children of defence martyrs. |
| Official website | sofworld.org |
SOF ISO 2026-27 Quick Links
SOF ISO 2026-27 Important Dates
SOF has confirmed the SOF ISO 2026-27 exam dates. The result, answer key and Level 2 exam dates are to be announced. Dates were checked on 30 October 2026 against sofworld.org.
| Event | Date |
|---|---|
| Exam date | 30 October 2026 |
| Exam date | 19 November 2026 |
| Exam date | 3 December 2026 |
| Registration (through school) | Open now |
| Result | To be announced |
| Answer key | To be announced |
| Level 2 exam | To be announced |
How to Apply for SOF ISO 2026-27
Registration through schools only; schools send registrations up to 30 days before their chosen exam date. The fee is rs 170 (incl. GST) per student per Olympiad, paid by the school to SOF (India, Bhutan, Nepal); the school may collect Rs 30 more, so students pay Rs 200 at school. No fee for students with a major physical disability or children of defence martyrs.
Is the SOF ISO 2026-27 application form out?
Yes. Registration through schools only; schools send registrations up to 30 days before their chosen exam date.
- Exam date
- 30 October 2026
- Exam date
- 19 November 2026
- Exam date
- 3 December 2026
Steps to Apply for SOF ISO 2026-27
- Registration is only through the student’s school; individual registrations are not accepted.
- A school must register at least 10 students for SOF ISO.
- The school registers as an exam centre (no fee) and fills the School Registration Form (SRF) and Students’ Registration Sheet (SRS).
- Student pays the Olympiad fee at school; the school sends forms and fees to SOF before the last date (usually about 30 days before the exam).
- SOF generates roll numbers for all registered students from the SRS.
Who can apply for SOF ISO 2026-27?
Classes 1-12 in a school registered with SOF; Level 2 for classes 3-12 only.
Qualifying and selection: Level 2 qualifiers (Classes 3-12): top 5% of Level 1 candidates class-wise (ties broken by section-wise weightage), top 25 rank holders class-wise in each zone, and the class topper of each school where at least 10 students of the class appear and score 50%.
What is the SOF ISO exam pattern?
SOF ISO has multiple-choice questions and lasts 60 minutes. Mode: offline (pen-paper, objective MCQ). The number of questions and marks depend on the class:
| Class | Questions | Marks | Sections |
|---|---|---|---|
| Level 1: Classes 1 to 4 | 35 | 40 | Logical Reasoning 5 Q (5 marks), Science 25 Q (25), Achievers Section 5 Q x 2 = 10 |
| Level 1: Classes 5 to 10 | 50 | 60 | Logical Reasoning 10 Q (10 marks), Science 35 Q (35), Achievers Section 5 Q x 3 = 15 |
| Level 1: Classes 11 and 12 | 50 | 60 | Physics & Chemistry 25 Q (25 marks), Mathematics or Biology 20 Q (20), Achievers Section 5 Q x 3 = 15 |
| Level 2: Classes 3 and 4 | 35 | 40 | Science 30 Q (30 marks), Achievers Section 5 Q x 2 = 10 |
| Level 2: Classes 5 to 10 | 50 | 60 | Science 45 Q (45 marks), Achievers Section 5 Q x 3 = 15 |
| Level 2: Classes 11 and 12 | 50 | 60 | Physics & Chemistry 25 Q (25 marks), Mathematics or Biology 20 Q (20), Achievers Section 5 Q x 3 = 15 |
Based on CBSE, ICSE/ISC and State Board syllabi; Level 1 has 60% questions from the current class and 40% from the previous class, while Level 2 and the Achievers Section use the current class syllabus only. Classes 11-12 choose Mathematics or Biology for one section.
What do SOF ISO toppers get?
Level 2 (Classes 3-12) top 5 international rankers get Rs 50,000 / 25,000 / 10,000 / 7,500 / 5,000 (Classes 1-2, on Level 1: Rs 25,000 / 10,000 / 7,500 / 5,000 / 2,500) with medals for the top 3; zonal ranks 1-3 get Rs 5,000 / 2,500 / 1,000, zonal ranks 4-10 a gift worth Rs 500, plus medals and certificates.
SOF ISO 2026-27 Official Notices and Links
Every date on this page comes from these official pages (30 October 2026):
- sofworld.org/iso/about-sof-international-science-olympiad-iso-exam/sof-i – Exam date
- sofworld.org/exam-schedule – Registration (through school)
- sofworld.org/registeryourschool – Registration (through school)
- results.sofworld.org/results – Result
- sofworld.org/ – Answer key
- sofworld.org/iso – Answer key
SOF ISO 2026-27 FAQs
When is the SOF ISO 2026-27 exam?
Level 1 Date 1: 30 Oct 2026 (held today). Level 1 Date 2: 19 Nov 2026. Level 1 Date 3: 03 Dec 2026.
Is SOF ISO 2026-27 registration open?
Registration through schools only; schools send registrations up to 30 days before their chosen exam date.
Who is eligible for SOF ISO?
Classes 1-12 in a school registered with SOF; Level 2 for classes 3-12 only.
How many questions are there in SOF ISO?
Class Level 1: Classes 1 to 4: 35 questions, 40 marks; Class Level 1: Classes 5 to 10: 50 questions, 60 marks; Class Level 1: Classes 11 and 12: 50 questions, 60 marks; Class Level 2: Classes 3 and 4: 35 questions, 40 marks; Class Level 2: Classes 5 to 10: 50 questions, 60 marks; Class Level 2: Classes 11 and 12: 50 questions, 60 marks – 60 minutes (Level 1).
What is the SOF ISO fee?
Rs 170 (incl. GST) per student per Olympiad, paid by the school to SOF (India, Bhutan, Nepal); the school may collect Rs 30 more, so students pay Rs 200 at school. No fee for students with a major physical disability or children of defence martyrs.
What is the official website of SOF ISO?
sofworld.org