The 20 Marks That Most Students Treat as a Formality
Internal assessment in CBSE Class 10 and Class 12 carries 20 marks per subject. These marks are awarded by your own school and are entirely within your control — unlike the external board examination, where you have no certainty about what questions will appear. Yet the vast majority of students treat internal assessment as an afterthought: submitting incomplete portfolios at the last minute, performing below their capability in periodic assessments, and leaving practicals to chance.
This is a deeply counterproductive approach. In a subject where the margin between 90% and 85% is the difference between a top college and a second-choice college, voluntarily sacrificing potential marks in the most controllable component of the examination is a strategy that no rational student would consciously choose — yet thousands do it implicitly through neglect.
This guide explains exactly how CBSE internal assessment works, what each component requires, and the specific, actionable steps that maximise your score in every component.
How CBSE Internal Assessment Is Structured
CBSE internal assessment (20 marks per subject in most cases) is divided into three components. Understanding each component clearly is the prerequisite for maximising your score across all three.
Periodic Assessments carry 10 marks and are derived from unit tests conducted by the school throughout the academic year. The standard CBSE practice is to conduct three Periodic Assessments and award marks based on the best two performances out of three. This structure means that a student who performs poorly in one Periodic Assessment has an opportunity to recover through subsequent assessments. However, it also means that a student who consistently underperforms in Periodic Assessments cannot recover through external examination performance alone — the 10 marks are entirely determined by school-level tests.
Student Enrichment Activity or Portfolio carries 5 marks. This component is subject-specific and varies significantly between subjects. In English, it typically involves a portfolio of written work maintained through the year. In Science, it involves documentation of class activities, experiments, and projects. In Social Science, it involves map work, project contributions, and other enrichment activities. In Mathematics, it may involve mathematical puzzles, projects, or practical applications of concepts studied. The evaluation criteria for this component are broad but consistently reward completeness, organisation, and evidence of regular engagement rather than a single high-quality piece submitted at the last moment.
Practical Work or Subject-Specific Project carries 5 marks. In Science subjects, this is a practical examination conducted by the school. In languages, it typically involves an oral assessment or a speaking and listening activity. In other subjects, it may involve a project submission with a presentation component.
Periodic Assessments — Treating Them as What They Are
The single most valuable mindset shift a student can make regarding Periodic Assessments is to treat them with exactly the same preparation seriousness as the board examination itself. Not because the stakes are as high — they are not — but because the habits built in Periodic Assessment preparation directly transfer to board examination preparation.
A student who consistently approaches each Periodic Assessment with a clear revision plan, completes the relevant past questions before the test, and reviews every error in the marked paper afterwards is not just maximising 10 internal assessment marks. They are building the study habits, subject knowledge, and examination skills that will serve them in the board paper. The student who treats Periodic Assessments as interruptions to "real" studying and revises minimally for them is both sacrificing guaranteed marks and failing to use the most useful rehearsal opportunity available to them.
For each Periodic Assessment: identify the chapters being tested, complete all chapter-end exercises from the NCERT textbook, practise 10 to 15 additional questions per chapter from supplementary resources, and review the previous Periodic Assessment paper to ensure that errors from that test have been understood and corrected. This is not a time-consuming approach — 2 to 3 hours of focused preparation per subject per Periodic Assessment is sufficient.
The portfolio component of CBSE internal assessment is almost universally submitted in a rushed, incomplete state. Students who maintain their portfolio continuously throughout the year — adding work at regular intervals, keeping it organised, ensuring all required components are present — score 4 to 5 marks on this component routinely. Students who assemble the portfolio the week before submission typically score 2 to 3 marks, not because their work is worse but because incomplete and disorganised portfolios signal to evaluators that the student did not engage with the activity as intended. Start your portfolio on the first day of the academic year and add to it consistently. This single habit can be worth 2 additional marks that cost almost no extra effort.
Science Practicals — The Most Undervalued Component
In CBSE Class 10 and Class 12 Science subjects, the practical examination carried out by the school is evaluated on multiple sub-components: the student's ability to perform the experiment, their lab record, their ability to identify specimens or equipment, their viva voce responses, and in some cases their project work. Each sub-component has its own marks allocation, and each can be maximised with specific preparation.
The most impactful preparation activity for Science practicals is performing each standard experiment at least three times before the practical examination — once with guidance from a teacher or textbook, once with guidance available but not consulted, and once entirely from memory with a friend observing for errors. This three-stage approach mirrors the progression from learning to competence to fluency that a practical examiner rewards. A student who can perform a titration, a refraction experiment, or a germination study smoothly and without hesitation demonstrates practical competence in a way that is immediately visible to the examiner.
Viva voce questions in Science practicals are almost entirely drawn from a predictable pool: the purpose of the experiment, the precautions to be taken, the sources of error, and the applications of the principle being demonstrated. Preparing brief, clear answers to these questions for each standard experiment takes less than two hours and can be worth 2 to 3 marks in the practical examination.
A Note on Academic Integrity
CBSE internal assessment marks are subject to moderation through random school inspections. Schools that consistently over-award internal assessment marks face formal consequences including reduced marks for all students in the moderation process. The most secure approach is always to genuinely perform well in internal assessment rather than to seek inflated marks through any route. A student who genuinely scores 18 out of 20 in internal assessment through consistent effort and quality work has both the marks and the skills — a far better position than a student who receives an inflated 19 or 20 and lacks the corresponding understanding.
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