How the Best-of-Two Rule Works
2026 is the first year of CBSE’s two-board-exam system for Class 10. Phase 1 (Feb–Mar) was the main exam; Phase 2 (held 15–21 May 2026) was the optional improvement and compartment exam. When the Phase 2 result is declared, CBSE prepares your final consolidated marksheet using one simple rule, applied subject by subject:
Final subject score = the higher of your Phase 1 and Phase 2 scores. Your Phase 1 marks can never go down — a weaker Phase 2 attempt is simply ignored for that subject.
Three things follow from this rule that students often get wrong:
- Zero risk: appearing in Phase 2 could only maintain or improve your marksheet, never hurt it.
- Per subject, not overall: you might improve in Maths but keep your Phase 1 Science score — each subject is decided independently.
- Internal assessment is frozen: only the theory paper was re-examined in Phase 2. Your Phase 1 internal assessment marks carry into the final score.
Worked Example
| Subject | Phase 1 | Phase 2 | Final (best of two) |
|---|---|---|---|
| English | 81 | — | 81 |
| Hindi | 78 | — | 78 |
| Maths | 62 | 79 | 79 ✅ improved |
| Science | 70 | 66 | 70 🔒 Phase 1 kept |
| Social Science | 74 | — | 74 |
| IT 402 | 88 | N/A | 88 |
Final Best of 5 takes the five highest final scores (with at least one language): IT 402 (88) + English (81) + Maths (79) + Hindi (78) + Social Science (74) = 400 / 500 = 80.0%. Science (70) is dropped — IT 402 effectively replaced it. With Phase 1 marks alone this student had 78.2%, so Phase 2 lifted the final percentage by +1.8%. The calculator applies exactly this logic — best-of-two first, then the Best of 5 rule with IT 402 replacement — so you don’t have to work it out by hand.
Who Should Use This Calculator
- Improvement candidates — see how much your percentage rises if your Phase 2 estimate holds.
- Compartment candidates — check your passing status and final percentage once Phase 2 marks are known.
- Before the result: use your estimated Phase 2 marks from the verified answer keys. After the result: enter actual marks for your exact final marksheet.