CBSE Internal Assessment & the best-2-of-3 periodic test rule.

In CBSE Classes 9 and 10, each scholastic subject is marked out of 100: an 80-mark examination plus a 20-mark Internal Assessment (IA). For Class 10 the 80-mark component is the Board exam; for Class 9 it is the school’s annual exam, following the same blueprint. The 20-mark IA is school-based and recorded per subject, per term.

The four parts of the 20-mark Internal Assessment

The IA is not a single test. CBSE splits it into four 5-mark components:

• Periodic Test (5 marks). Pen-and-paper tests during the year, restricted to three per subject. The average of the best two is taken.
• Multiple Assessment (5 marks). Diverse techniques chosen by the teacher (quizzes, oral, concept maps, group work) mapped to specific learning outcomes.
• Portfolio (5 marks). A curated record of the student’s classwork, reflections and progress across the year.
• Subject Enrichment Activity (5 marks). Subject-specific skill work: practical/lab work in Science, projects in Maths, speaking-and-listening in languages.

Where “best 2 of 3” comes from

The phrase refers specifically to the 5-mark Periodic Test component. A school conducts three periodic tests in a subject through the year, but only the average of the best two scores counts toward IA. A weak day on one test does not sink the component, and the third test still gives every student a recovery opportunity.

How IA joins the 80-mark paper

The 80-mark paper follows CBSE’s published section-wise blueprint: objective (Section A), short answers (B and C), long answers (D) and case- or source-based questions (E), with roughly 40–50% of marks competency-based rather than direct recall. The 80 and the 20 are then added for a subject total out of 100, which feeds the grade and, ultimately, the CGPA.

Why this is error-prone on paper

Each subject needs three periodic tests recorded, the lowest dropped, the best two averaged and scaled, then summed with three more components — per student, per subject, per term. Done by hand across a class, the best-2-of-3 step alone is a reliable source of arithmetic slips that only surface at report-card time.