Every CBSE Class 10 subject is marked out of 100 — but 80 marks come from the board exam while 20 marks come directly from your school. These 20 marks are called Internal Assessment (IA). Most students ignore them thinking board marks are everything, but your IA score can be the difference between an A1 and an A2 grade — or between passing and compartment. This guide explains every component, how schools calculate them, and exactly what you can do to maximise all 20 marks.
What Are the 20 Internal Assessment Marks?
CBSE splits every Class 10 subject into two parts. The board exam (written exam held in February–March) is worth 80 marks. The Internal Assessment is worth 20 marks and is conducted entirely by your school throughout the academic year.
The 20 IA marks are submitted by your school to CBSE before results are declared. CBSE then adds them to your board exam score. This means your school has already decided 20% of your result — before you even walk into the exam hall.
Important: There is no separate pass mark for IA alone. CBSE only checks that your theory + IA combined total is 33 or above. So even if you score low in IA, you can compensate with the board exam — as long as the combined total crosses 33.
The 3 Components: Breakdown and Marks
The 20 marks are divided into exactly three components. Every school in India must follow this structure — it is not optional or school-specific.
| Component | Marks | Who Conducts It | When |
|---|---|---|---|
| Periodic Tests | 10 marks | Your school (in-house) | Throughout the year |
| Notebook Submission | 5 marks | Subject teacher | End of term |
| Subject Enrichment Activity | 5 marks | Subject teacher | During the year |
| Total IA | 20 marks | — | — |
Let us now look at each component in detail.
Periodic Tests (10 Marks)
Periodic tests are small written exams conducted by your school during the academic year. They are the biggest component of IA at 10 out of 20 marks.
How many tests are conducted?
CBSE requires schools to conduct at least 3 periodic tests per subject per year. However, only the best 2 out of 3 test scores are averaged and counted toward your final IA marks. This is similar to the Best of 5 logic used in percentage calculation.
Schools set their own paper length. The score is later scaled down to 10 marks by CBSE's formula.
If you perform poorly in one test, it does not ruin your IA. Only your two best scores are used.
What topics are covered?
Each periodic test covers a specific portion of the syllabus — not the whole syllabus at once. Your teacher will inform you in advance which chapters are included. These tests are shorter and more focused than your half-yearly or pre-board exams.
Student tip: Since only the best 2 out of 3 are counted, you can afford to have one bad test. But do not rely on this — score well in all three and remove any risk entirely.
Notebook Submission (5 Marks)
Your subject teacher evaluates your class notebook and gives you up to 5 marks. This is entirely in your school's hands.
What does the teacher check?
The exact criteria vary slightly by school, but CBSE's guidelines specify that teachers should evaluate based on:
- Regularity — Is every class's work written in the notebook? Are dates present?
- Neatness and presentation — Is the notebook clean, organised, and legible?
- Completion — Are all exercises, diagrams, and answers completed?
- Corrections done — Have you corrected marked work after the teacher returned it?
Common mistake: Many students maintain a rough notebook and a "fair" notebook only for submission. Teachers can usually tell. The safest approach is to keep one clean, complete notebook used daily from day one of the academic year.
When is the notebook submitted?
Schools typically collect notebooks for evaluation toward the end of the academic year, before the board exams begin. Your teacher will give a date. Make sure your notebook is fully updated and neat by then — do not wait until the last week to fill in missing entries.
Subject Enrichment Activity (5 Marks)
This 5-mark component is a practical or activity-based assessment that differs by subject. It is designed to test application of knowledge, not just theory.
| Subject | Enrichment Activity |
|---|---|
| English | Speaking and listening assessment — conversation, role play, or reading aloud |
| Hindi / Language 2 | Speaking and listening — recitation, conversation, or storytelling |
| Mathematics | Activities from the CBSE lab manual — constructing figures, data collection projects |
| Science | Practical lab work — experiments listed in the CBSE practical list |
| Social Science | Map work, project work, or activities related to civics and economics |
The teacher conducts these activities in class during the year and records your performance. Most students score well here because the tasks are straightforward when done sincerely.
Note: For Science, the enrichment activity is closely linked to your practical exam. Students who take lab sessions seriously tend to score full marks in this component.
Real Examples: How IA Changes Your Grade
Let's see two real student scenarios to understand why IA matters more than most students think.
Scenario A — IA saves Rohan's grade
Rohan scored 58 out of 80 in the Maths board exam. His IA was 18 out of 20. Total: 76/100 — that's a B1 grade. Without strong IA, a 58/80 on its own would feel much worse and could have pushed him into B2 territory.
Scenario B — Low IA hurts Priya's percentage
Priya scored 70/80 in Science but only got 12/20 in IA due to a messy notebook and missing one periodic test. Her total: 82/100 instead of a possible 90+. That difference dropped her from A1 to A2 and affected her Best of 5 percentage for stream admission.
Scenario C — IA alone cannot save a failing board score
Arjun scored only 20/80 in Social Science board exam. Even with full 20/20 IA, his total is only 40/100. He passes, but barely. If his IA was 10/20 instead, his total would be 30 — compartment. Low board scores + low IA = serious risk.
Check if you will pass with your current marks
Use our free Pass Checker — enter your expected theory and IA marks for each subject and get an instant verdict.
Open Pass Checker →How to Maximise All 20 Marks
These 20 marks are the easiest marks you will ever get in Class 10 — because they do not depend on a single exam day. They are spread across the entire year and are fully in your control. Here is exactly what to do:
For Periodic Tests (10 marks)
- Find out the test schedule from your teacher at the start of the year and mark it in your calendar.
- Prepare specifically for each test's portion — do not study everything, just the chapters in scope.
- Even if you have one bad test, make sure the other two are strong. The best 2 are counted.
- Never miss a test without a genuine reason — a zero for an absent paper still counts unless the school has a re-test policy.
For Notebook Submission (5 marks)
- Write the date on every page from day one. Teachers check this to verify regularity.
- Leave a margin and write neatly — presentation matters.
- Complete all exercises done in class, even if you finish them at home that evening.
- When a teacher corrects your work, make the corrections in pen or pencil immediately and do not erase the original marks.
For Subject Enrichment Activities (5 marks)
- Attend every practical class for Science — missing even one lab session can affect your marks.
- For English and Hindi, participate actively in speaking activities. Even quiet students who make an effort are noticed.
- For Maths, complete all activity-based tasks on time and keep your activity record book updated.
The golden rule: Treat IA as free marks. A student who earns 19–20 out of 20 in IA has already secured nearly one-fifth of their total marks before the board exam even begins. That is a massive advantage.
Calculate your Best of 5 percentage
Once you know your IA + board exam totals, use our calculator to find your final CBSE percentage including Skill Subject replacement.
Open Calculator →Frequently Asked Questions
No. CBSE does not have a separate minimum mark for IA. Only the combined total of theory (80) + IA (20) must reach 33 out of 100. So even if your IA is very low, you can still pass if your board exam score is high enough to bring the combined total to 33 or above.
Yes. Your school evaluates you on the three components and can give you any score from 0 to 20 based on your actual performance. CBSE does not interfere with IA scores unless there is evidence of malpractice or manipulation. This is why taking periodic tests, notebook maintenance, and enrichment activities seriously matters.
Yes. The Best of 5 percentage uses each subject's total score out of 100 — which is theory + IA combined. So your IA marks directly affect your Best of 5 percentage and therefore your eligibility for streams in Class 11.
This depends on your school's policy. Most schools allow a makeup test if you provide a medical certificate. However, CBSE's rule only requires that the best 2 out of 3 tests are counted — so if you miss one test and have a zero, your remaining two tests are what count. Talk to your subject teacher immediately if you miss a test.
No. Skill subjects like IT (Information Technology) and AI (Artificial Intelligence) have a different marking structure — they are typically marked out of 100 with a larger practical component. The 20-mark IA structure applies specifically to the five main subjects: English, Hindi/Language 2, Mathematics, Science, and Social Science.
CBSE's re-evaluation process (verification and photocopy requests) applies to the board exam (80 marks) only — not to IA marks. IA marks are submitted by your school and CBSE does not re-evaluate them. If you believe your IA marks are wrong, you need to raise the concern with your school's principal before the marks are submitted to CBSE.
Yes. Your CBSE Class 10 marksheet shows both the theory marks and the internal assessment marks separately for each subject, along with the combined total. This means you — and any school or institution reviewing your marksheet — can see exactly how many marks came from IA versus the board exam.