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ISO Answer Key 2026-27 for Class 1 to 12 - Download SOF ISO Set A, B, C PDF
#NSO
The Science Olympiad Foundation (SOF) will release the SOF ISO answer key for Set A, Set B and Set C in November 2026, December 2026 and January 2027. The Science Olympiad Foundation will conduct Sets A, B, and C exams in October 30, 2026, November 19, 2026 and December 3, 2026 , respectively. The ISO answer key 2026-27 will be released online on the official website, sofworld.org.
Students should know that ISO Set A, B, and C answer keys are released separately. Using the answer key of ISO, students can compute their estimated marks in the SOF ISO exam. Last year, SOF published the ISO answer key on December 16, 2025, December 27, 2025 and January 2, 2026, for Sets A, B and C, respectively. Read the article for more information and to download the SOF ISO 2026–27 answer key.
ISO Answer Key 2026-27 PDF Download
We will provide the ISO 2026-27 answer key links below. Using ISO answer keys for Classes 1–12, students will be able to calculate their probable marks and compare them with ISO Cutoff 2026-27 to know the chances of selection.
| Particulars | Answer Key Link |
|---|---|
| ISO Set A Answer Key | Available soon |
| ISO Set B Answer Key | Available soon |
| ISO Set C Answer Key | Available soon |
Important Dates of ISO Answer Key 2026-27
The International Science Olympiad (ISO) is an annual scholarship test designed to develop scientific reasoning and logical abilities in school students. It is conducted at two levels. Students must note ISO 2026-27 answer key dates to make sure they do not miss any essential events. Check the SOF ISO answer key 2026-27 dates for levels 1 & 2 below.
| Events | Dates |
|---|---|
| ISO 2026-27 Exam (Level 1) Set A | October 30, 2026 |
| ISO 2026-27 Exam Level 1 (Set B) | November 19, 2026 |
| ISO 2026-27 Exam (Level 1) Set C | December 3, 2026 |
| ISO 2026-27 Answer Key for Level 1 (Set A) | November 2026 |
| ISO 2026-27 Answer Key for Level 1 (Set B) | December 2026 |
| ISO 2026-27 Answer Key for Level 1 (Set C) | January 2027 |
| ISO cut-off 2026-27 | January 2027 |
| ISO 2026-27 Result Date for Level 1 | January 2027 |
| ISO Answer Key 2026-27 for Level 2 | March 2027 |
| ISO Result Date for Level 2 | March 2027 |
ISO Level 2 Exam Dates
| Category | Exam Date | Regions / Mode |
|---|---|---|
| Domestic | February 2027 | All regions |
| International | February 2027 | Hybrid mode |
How to Download ISO Answer Key 2026-27?
Students can read and download the ISO 2026-27 answer key by following the instructions outlined below.
- Click on the link given in the table above.
- Your screen will display the ISO answer key for 2026–27.
- Now, press the download button.
- The answer key will be downloaded in PDF format.
- Start carefully examining the answers and calculate your scores using the SOF ISO 2026-27 answer key.
Also, check -
ISO Results 2026–27
SOF releases the ISO 2026–27 results online through the official website. The International Science Olympiad result is also sent to the individual schools by the Science Olympiad Foundation (SOF). Each participating student receives a participation certificate as well as a Student Performance Report (SPR). SPR includes a full review of exam performance in several parts. Gold, Silver, and Bronze medals are awarded to class toppers. The results will also be made accessible online.
How to Calculate Scores with the ISO Answer Key 2026-27?
To compute results using the ISO 2026-27 answer key, students must follow the marking scheme provided.
- Add relevant marks for each correct answer.
- There will be no negative deduction.
ISO Class 1 to 4 Marking Scheme
| Section | No. of Questions | Marks per Question | Total Marks |
|---|---|---|---|
| Logical Reasoning | 5 | 1 | 5 |
| Science | 25 | 1 | 25 |
| Achievers Section | 5 | 2 | 10 |
| Grand Total | 35 | 40 |
ISO Class 5 to 10 Marking Scheme
| Section | No. of Questions | Marks per Question | Total Marks |
|---|---|---|---|
| Logical Reasoning | 10 | 1 | 10 |
| Science | 35 | 1 | 35 |
| Achievers Section | 5 | 3 | 15 |
| Grand Total | 50 | 60 |
ISO Class 11 to 12 Marking Scheme
| Section | No. of Questions | Marks per Question | Total Marks |
|---|---|---|---|
| Physics & Chemistry | 25 | 1 | 25 |
| Achievers Section | 5 | 3 | 15 |
| Mathematics/Biology | 20 | 1 | 20 |
| Grand Total | 50 | 60 |
The previous years' ISO answer keys are provided below.
ISO Answer Key 2025-26
| Particulars | Answer Key Link |
|---|---|
| NSO Set A Answer Key | Download Here |
| NSO Set B Answer Key | Download Here |
| NSO Set C Answer Key | Download Here |
ISO Answer Key 2024-25
| Particulars | Answer Key Link |
|---|---|
| ISO Set A Answer Key | Download Here |
| ISO Set B Answer Key | Download Here |
| ISO Set C Answer Key | Download Here |
ISO Answer Key 2023-24
| Particulars | Answer Key Link |
|---|---|
| ISO Set A Answer Key | Download here |
| ISO Set B Answer Key | Download here |
| ISO Set C Answer Key | Download here |
ISO Answer Key 2023 (Official) - Download Here
| Class | ISO Set A Answer Key | ISO Set B Answer Key | ISO Set c Answer Key |
|---|---|---|---|
| Class 1 | Download here | Download here | Download here |
| Class 2 | Download here | Download here | Download here |
| Class 3 | Download here | Download here | Download here |
| Class 4 | Download here | Download here | Download here |
| Class 5 | Download here | Download here | Download here |
| Class 6 | Download here | Download here | Download here |
| Class 7 | Download here | Download here | Download here |
| Class 8 | Download here | Download here | Download here |
| Class 9 | Download here | Download here | Download here |
| Class 10 | Download here | Download here | Download here |
| Class 11 | Download here | Download here | Download here |
| Class 12 | Download here | Download here | Download here |
Confused between CGPA and Percentage?
Get your results instantly with our calculator!
💡 Conversion Formula used is: Percentage = CGPA × 9.5
Frequently Asked Questions (FAQs)
Q: Is there any negative marking in the ISO exam 2026-27?
A:
No, the International Science Olympiad does not have negative marking.
Q: Will the ISO answer key 2026-27 be released on different dates for different classes?
A:
The ISO 2026–27 answer key will be released on different dates for different sets. The SOF answer key will be released online.
Q: Can I challenge the ISO 2026 answer key?
A:
There is no way to provide feedback or challenge the official answer key.
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Questions related to NSO
On Question asked by student community
Have a question related to NSO ?
Hello, the SOF NSO Level 2 results 2026 will be released in March 2026. You can check the results on the official SOF websites: sofworld.org and results.sofworld.org/results.
For more information, please check this link: SOF Level 2 Results 2026
I am assuming that you are asking for NSO sample questions. Click on the link provided below to access the same. Hope this will help you.
Link: NSO sample questions
Hi,
For Class 6 NSO Level 2 previous year question papers, you can visit this link -
question papers of NSO
Hope this will be helpfull...
You can download the NSO result from the official website of SOF at sofworld.org. You need to enter your name, mobile number, email address, roll number, and country.
Hello Student,
You can find the link to the Sof nso level 2 sample papers and not the previous years' papers
Link - NSO Sample Papers 2025-26 for Class 1 to 12, Download PDF
Hope this helps!
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