NSO Answer Key 2025-26 for all SETs are released by Science Olympiad Foundation (SOF). Students can now download the answer key for NSO 2025-26 at sofworld.org. NSO 2025-26 answer key will be used to calculate probable scores. The NSO answer key 2025 will comprise correct answers to all the questions asked in the exam. NSO exam 2025-26 was conducted on November 13, November 27 and December 11, 2025. Here we have provide the link to download the NSO 2025 answer keys.
NSO Answer Key 2025-26 Download Date
| Event | Dates |
| SOF NSO 2025-26 (Set A Exam) Date | November 13, 2025 |
| NSO 2025-26 (Set B Exam) Date | November 27, 2025 |
| SOF NSO 2025-26 (Set C Exam) Date | December 11, 2025 |
| Release date of NSO SET A answer key | November 2025 |
| Date of NSO SET B answer key | December 2025 |
| Release date of NSO SET C answer key | December 2025 |
| NSO Result Date | January 12, 2026 |
NSO Answer Key 2026 PDF Download
How to Download NSO Answer Key 2025-26?
Students should follow the below mentioned steps to download the NSO exam answer key
- Click on the above provided link – SOF Answer Key 2025-26
- Now click on the “SOF NSO ANSWER KEYS SET A”
- The class-wise NSO exam answer key will display on your screen
- Now, click on the download button.
- NSO answer key pdf will appear in new tab.
Download the NSO answer key in you computer for future use.
How to Calculate Scores with NSO answer Key 2025?
Students should follow the below steps to calculate the scores with the help of NSO 2025 answer key-
- Add positive marks for all the correct answers
- There will be no negative marking
Hence, the marks obtained through right answer is the final score.
NSO Marking Scheme 2025-26
| Class | Section | No. of Questions | Marks per Question | Total Marks |
| 1 to 4 | Logical Reasoning | 5 | 1 | 5 |
| Science | 25 | 1 | 25 | |
| Achievers Section | 5 | 2 | 10 | |
| Grand Total | 35 | 40 | ||
| 5 to 10 | Logical Reasoning | 10 | 1 | 10 |
| Science | 35 | 1 | 35 | |
| Achievers Section | 5 | 3 | 15 | |
| Grand Total | 50 | 60 | ||
| 11 & 12 | Physics & Chemistry | 25 | 1 | 25 |
| Achievers Section | 5 | 3 | 15 | |
| Mathematics/Biology | 20 | 1 | 20 | |
| Grand Total | 50 | 60 |
National Science Olympiad Cutoff 2018 (level 1) for Class 3 to 10
| CLASS | TOTAL MARKS | M1 | M2 | M3 |
| 3rd | 30 | 4 | 22 | 4 |
| 4th | 27 | 5 | 16 | 6 |
| 5th | 40 | 9 | 22 | 9 |
| 6th | 39 | 9 | 24 | 6 |
| 7th | 39 | 9 | 27 | 3 |
| 8th | 37 | 4 | 24 | 9 |
| 9th | 38 | 8 | 21 | 9 |
| 10th | 39 | 5 | 19 | 15 |
NSO Cutoff 2018 (level 1) – Class 11 and 12
| CLASS | TOTAL MARKS | M1 | M2 | M3 | M4 |
| 11th | 30 | 7 | 5 | 9 | 9 |
| 12th | 33 | 5 | 7 | 9 | 12 |
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