NCO Exam Pattern 2026-27: Marking Scheme, Sections and Duration

The NCO exam pattern is short and simple on paper: one objective paper of 60 minutes, taken at school, with 35 or 50 questions depending on the class. What changes from class to class is how the marks are spread across four sections, and that spread decides where a student should spend the most effort.

This page explains the pattern published by the Science Olympiad Foundation (SOF) for the 2026-27 session, the marks for each section, what SOF says about marking and ranking, and how to use the pattern in practice. SOF's current official pages carry this exam as the International Computer Science Olympiad (ICSO), while NCO is the older name still used by many schools, so the pattern below comes from those official pages.

NCO Exam Pattern

Section-wise Marking Scheme

Every paper has four sections, which SOF labels M1 to M4. SOF lists the Achievers Section first, because it is also the first tie-break section. The three tables below show the marks for each class group.

Classes 1 and 2

Classes 3 and 4

Classes 5 to 10

The Achievers Section contains higher order thinking questions drawn from the Computer Science and AI, Robotics and IT syllabus of the current class.

Negative Marking and Question Type

All questions are multiple choice with four options. SOF's published pattern gives marks per question for each section and does not mention any negative marking. The official sample paper pages also do not state a penalty. That means a wrong answer is not shown to cost marks, but this is based on what SOF has published, not on an explicit statement that there is no negative marking.

Read the instructions printed on your question paper before you start, and ask your school coordinator if you are unsure. Even without a penalty, guessing blindly teaches nothing. Eliminate one or two options first, and then choose.

What the Pattern Means for You

The table below converts the pattern into the share of total marks each section carries.

• Computer Science is half the paper: In every class, 20 or 30 questions come from this section, so strong fundamentals matter more than any other single area.

• Five Achievers questions carry a quarter of the marks: Each question is worth 2 or 3 marks, so missing all five costs as much as missing 10 to 15 ordinary questions. These questions reward understanding, not recall.

• Reasoning counts more in Classes 3 and 4: Each reasoning question is worth 2 marks in these classes, double the value in other classes, so puzzle practice pays off well here.

• The AI, Robotics and IT section is small but quick: Five questions are often answerable by following current technology news and by reading the section carefully.

Mode, Language and Exam Conduct

• School-based test: The exam is organised in the student's own school during school hours. Students do not travel to a separate centre.

• Paper-based: SOF lists the mode as offline. Answers are marked on the paper provided by the school as per SOF's guidelines.

• English only: The paper is set in English.

• Two dates, separate papers: SOF holds the exam on two dates and uses a different question paper for each. A school picks one date and cannot change it.

• Own class paper: A student appears only in the paper of their own class.

How Ties Are Broken in Ranking

Ranks are based on total marks. When two students have the same total, SOF looks at section marks in a fixed order of priority. A student who scored more in the higher priority section gets the better rank. Students who tie on both total marks and every section priority share the same rank.

This is a good reason to attempt the Achievers Section carefully rather than leave it for the last minute.

Time Management and Exam-Day Strategy

The time per question is tight in the longer paper. A 50 question paper in 60 minutes gives about 72 seconds per question, while a 35 question paper gives close to 100 seconds.

1. Start with the section you know best: Use the first 25 to 30 minutes to collect marks from Computer Science, since it carries half the paper.

2. Keep 12 to 15 minutes for the Achievers Section: These questions need reading and thinking, and they carry the first tie-break priority.

3. Do reasoning in short bursts: Skip any figure question that takes more than two minutes, mark it and return if time remains.

4. Use the last 5 minutes to check: Confirm that every question is marked and that each answer is in the correct row.

This split is a practical suggestion, not an official rule. Adjust it after your first few timed papers, based on where you actually lose time.

Older Pages and Common Confusions

Older pages may still show a different version of the exam, so follow the SOF pages for the current session. Some points that commonly cause confusion are listed below.

• Two levels or Classes 1 to 12: Some articles describe a Level 2 round or Classes 11 and 12. SOF's current pages say the exam is for Classes 1 to 10 and has no Level 2.

• Three sections instead of four: Some pages merge the sections into Logical Reasoning, Computers and IT, and Achievers. The current SOF pattern lists four sections with separate marks.

• One question count for all classes: The correct count is 35 for Classes 1 to 4 and 50 for Classes 5 to 10.

• Similar names: Other organisations also run cyber or computer olympiads with similar names and different patterns. This page covers only the SOF exam, so confirm the conducting body on your registration form.

Practising in the NCO Pattern

Start with the official sample paper for your class, because it shows the exact style of questions. Then build speed with timed papers that copy the section split: for example, 35 questions with 5 high-value Achievers questions for Classes 1 to 4, or 50 questions with 30 from Computer Science for Classes 5 to 10.

You can attempt NCO-pattern practice tests on Testkart and use the section-wise report to see whether your marks are leaking in Computer Science, reasoning or the Achievers Section. Keep a log of every wrong answer and the reason, and revise it before the next paper.

Official Source

SOF publishes the pattern on its website. Check it before the exam, since details can change between sessions.

• Official website: https://sofworld.org/

• Official pattern and marking scheme page: https://sofworld.org/pattern-questions-and-marking-scheme