SOF NSO Answer Key 2025-26 for Class 1 to 12, Download PDF (Set A, B, C)

NSO Answer Key 2025-26 - The Science Olympiad Foundation (SOF) will release the NSO Set A, Set B, and Set C answer keys on separate dates in December 2025. The unofficial NSO answer keys are also yet to be provided by coaching institutes. NSO answer key 2025-26 for all sets will be releaed online on the official website, sofworld.org.

This Story also Contains

1. Important Dates of NSO Answer Key 2025-26
2. How to Download NSO Answer Key 2025-26?
3. How to Calculate Scores with the NSO Answer Key 2025-26?

SOF will conduct National Science Olympiad (NSO) exam on November 13, November 27, and December 11, 2025. Last year, SOF published NSO answer key on December 4, 19, and 24, 2024 for Set A, B and C, respectively. Students should know that NSO Set A, B, and C answer keys are released separately. Using the answer key of NSO, students can compute their estimated marks in the SOF NSO exam. Read the article for more information and to download the SOF NSO 2025–26 answer key.

Also, know about: SOF Olympiad results date

Important Dates of NSO Answer Key 2025-26

The National Science Olympiad (NSO) 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 NSO 2025-26 answer key dates to make sure they do not miss any essential events. Check the SOF NSO answer key 2025-26 dates for levels 1 & 2 below.

NSO Answer Key 2025-26 PDF Download

We will also provide the latest NSO 2025-26 answer key links once they are available. Using NSO answer keys for Classes 1–12, students can calculate their probable marks and compare them with NSO Cutoff 2025-26 to know the chances of selection.

The previous years' NSO answer keys are provided below.

NSO Answer Key 2024-25

NSO Answer Key 2023-24

NSO Answer Key 2023 (Official) - Download Here

How to Download NSO Answer Key 2025-26?

Students can read and download the NSO 2025-26 answer key by following the instructions outlined below.

1. Click on the link given in the table above.
2. Your screen will display the NSO answer key for 2025–26.
3. Now, press the download button.
4. The answer key will be downloaded in pdf format.
5. Start carefully examining the answers and calculate your scores using the SOF NSO 2025-26 answer key.

Also, check -

• NSO Syllabus 2025-26
• NSO Sample Papers 2025-26

NSO Results 2025–26

SOF releases the NSO 2025–26 results online through the official website. The National 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 NSO Answer Key 2025-26?

To compute results using the NSO 2025-26 answer key, students must follow the marking scheme provided.

• Add relevant marks for each correct answer.
• There will be no negative deduction.

NSO Class 1 to 4 Marking Scheme

NSO Class 5 to 10 Marking Scheme

NSO Class 11 to 12 Marking Scheme