SOF Answer Key 2025–26: IGKO, IEO, IMO, ICSO, NSO & NCO Solutions PDF

Mangane PriyankaUpdated on 18 Feb 2026, 12:20 PM IST

The Science Olympiad Foundation published the answer keys for ICSO, ISSO, ICO, IHO, IEO, IMO, NSO, and IGKO. The SOF answer keys for all sets are published through the official website in PDF format. Students can access and download the SOF answer key 2025-26 PDFs in online mode at sofworld.org. The foundation releases the SOF 2025-26 answer keys in Set A, B, & C formats. The SOF answer key 2025-26 aims to analyse the students’ performance in the examination.
SOF Answer Keys 2025-26: Download Here

This Story also Contains

SOF Olympiad-Wise Answer Keys 2025-26
SOF Answer Key 2025-26 Dates
How to Download the SOF 2025-26 Answer?
How to Calculate Marks for SOF Olympiad Exams 2025-26?

SOF Answer Key 2025-26

The main aim of the Science Olympiad Foundation is to enhance and assess students’ knowledge in various subjects like English, Mathematics, Science, etc. It consists of the correct answers to the questions that appeared in the SOF Olympiad exam 2025-26. Students can check and match their answers, predict their probable rank and score accordingly. Read the article to learn more about the SOF answer key 2025-26.

SOF Olympiad-Wise Answer Keys 2025-26

SOF Answer Key 2025-26 Dates

Candidates are required to keep track of all the important dates related to the SOF answer key 2025-26. As the foundation conducts various exams for olympiads, students need to be aware of the exam they are opting for and are appearing for. All the SOF Olympiad 2025-26 exams are held on different dates, so students need to make sure that they are up-to-date on all the latest information regarding the Olympiads. Candidates must keep visiting the official website to learn more about the SOF 2025-26 answer key. They can check out the table below to learn about the answer key dates.

SOF 2025-26 Answer Key Dates

Olympiad Event Particulars	Answer key release dates	SOF exam dates
IMO Answer key date	Set A: December 16, 2025 Set B: December 31, 2025 Set C: January 2, 2026	November 12, 2025 November 28, 2025 December 12, 2025
IEO answer key date	Set A: November 3, 2025 Set B: December 16, 2025 Set C: December 22, 2025	September 26, 2025 November 11, 2025 November 26, 2025
ICSO answer key date	Set A: November 3, 2025 Set B: November 25, 2026 Set C: February 10, 2026	September 24, 2025, October 9, 2025 January 22, 2026
NSO answer key date	Set A: December 16, 2025 Set B: December 27, 2025 Set C: January 2, 2026	November 13, 2025 November 27, 2025 December 11, 2025
IGKO answer key date	Set A: October 31, 2025 Set B: November 25, 2025 Set C: December 3, 2025	September 25, 2025, October 8, 2025 November 7, 2025
IHO answer key date	Set A: November 3, 2025 Set B: January 19, 2026 Set C: February 10, 2026	September 19, 2025, November 19, 2025 January 22, 2026
ISSO answer key date	Set A: November 3, 2025 Set B: January 16, 2026 Set C: February 12, 2026	September 18, 2025, November 20, 2025 January 23, 2026
ICO answer key date	Set A: October 31, 2025 Set B: December 3, 2025	September 18, 2025, November 7, 2025

How to Download the SOF 2025-26 Answer?

The Science Olympiad Foundation releases the SOF answer keys in online mode for Olympiad exams. Students can follow the steps mentioned below to learn more about downloading the SOF 2025-26 answer key.

Step 1: Visit the official website at sofworld.org.
Step 2: Click on the “SOF Answer Key and Cutoff” link.
Step 3: Select the respective SOF exam answer key set and choose the level to access the answer key.
Step 4: Download the SOF answer key 2025-26 for the respective class and exam chosen.
Step 5: Calculate the scores by adding up the marks secured in the exam to get the correct answers.

How to Calculate Marks for SOF Olympiad Exams 2025-26?

Students can calculate their SOF Olympiad exam 2025-26 marks by following the procedure. Check out the steps below to learn more about how to calculate SOF exam marks.

Candidates need to access and download the answer key from the official website.
They need to match the marks with the answer key downloaded.
Students can calculate the final marks by adding up the answer key marks to the marks they secured in the respective exam.
They can refer to the respective SOF Olympiad exam marking scheme to learn more about the calculation of marks.
The foundation will award the respective marks for each correct answer by matching the scores in the answer key.

Can I raise objections against the SOF Answer Key 2025-26?

The Science Olympiad Foundation does not have any such provisions to raise objections against the SOF 2025-26 answer key. Students won’t be able to avail of this facility as the foundation has no such provision. Candidates are advised to mark their answers very carefully while appearing for the Olympiad exams.

Frequently Asked Questions (FAQs)

Q: What are the olympiad exams the SOF offers to students?

The SOF offers olympiads like IMO, ICO, IGKO, IEO, ICSO, ISSO, NSO, NCO, and IHO.

Q: Who conducts the SOF Olympiad exams 2025-26?

The Science Olympiad Foundation is the conducting body of the SOF 2025-26 Olympiad exams.

Q: What is the official website of the SOF answer key 2025-26?

Students can check out the SOF 2025-26 answer keys for Olympiad exams on the official website at sofworld.org.

Q: At which level the SOF Olympiad examinations are conducted?

The SOF exams are conducted for students at national and international levels to enhance their knowledge in various disciplines like Social Studies, Hindi, English, Mathematics, Science, etc.

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