Bihar Board 12th half yearly exam answer key 2026-27: unofficial keys available as exams continue

The Bihar School Examination Board (BSEB) is currently conducting the 12th Half Yearly Examinations for the 2026-27 academic session across Bihar. These examinations, which commenced on September 18, 2026, are scheduled long story short on September 26, 2026. Students are now seeking answer keys for various subjects, with unofficial versions prepared by educational portals and subject matter experts becoming available, including for the Chemistry half-yearly exam 2026.

The half-yearly examination serves as a crucial preparatory assessment for students aiming for the 2027 annual examination, which is slated to take place from February 1 to February 12, 2027. According to Bihar Board Chairman Dr. Tyag Rajan Sam M, the half-yearly examination mirrors the final examination in its structure and the board’s involvement in question paper distribution. Participation and successful completion of these half-yearly exams are prerequisites for eligibility in the upcoming annual examinations.

Examination Structure and Schedule

The Bihar Board 12th half-yearly examination is being conducted in two sittings daily. The first sitting runs from 09:30 AM to 12:45 PM, while the second sitting is scheduled from 02:00 PM to 05:15 PM. Students are allotted a 15-minute ‘Cool Off Time’ during the examination. The question papers for these exams, which are prepared and dispatched by the board, were sent to schools and colleges through a confidential agency between September 7, 2026, and September 15, 2026.

Each half-yearly exam is a 100-mark paper. Students are required to answer 50 out of 80 objective questions, alongside subjective questions accounting for 50 marks. This pattern is designed to familiarise students with the format of the final annual examination. Answer keys for subjects such as Physics, Chemistry, Biology, Accountancy, Business Studies, Mathematics, Economics, Political Science, Geography, History, English, and Hindi are anticipated to become available unofficially as the exams progress.

Accessing and Using Answer Keys

The Bihar School Examination Board (BSEB) does not officially release answer keys for the 12th Half Yearly Examinations on its website, biharboardonline.com. As a result, students rely on unofficial answer keys provided by various educational portals and subject matter experts. For instance, unofficial answer keys for subjects such as Physics, Chemistry, Biology, Accountancy, Business Studies, Mathematics, Economics, Political Science, Geography, History, English, and Hindi are anticipated to become available as the exams progress. The answer key for the Chemistry half-yearly exam 2026 is already available through these unofficial sources.

To effectively use these unofficial answer keys, students are advised to download the relevant subject’s answer key and have their question paper readily available. They can then compare their answers with the provided key, applying the prescribed marks for correct responses. The total marks for correct answers should be added to estimate the score for the subject. Deductions for incorrect answers should only be made if negative marking is explicitly stated for that particular question or exam. This process helps students gauge their performance in the 100-mark half-yearly examination, which includes 50 objective questions (out of 80) and 50 marks for subjective questions.

Written by Nishit Kumar

Nishit Kumar is a senior EdTech industry leader with over a decade of experience in building and scaling education platforms, shaping their product, content, and growth strategy. At FindMyCollege, Nishit oversees content and editorial strategy, guiding topic selection and content frameworks to ensure accuracy, relevance, and student-first value across the website.

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Further reading

• TN 11th quarterly exam answer keys 2026-27 available for download
• CBSE Class 10 Half Yearly Exam Paper 2025-26 with Answer Key Released for Mid-Term Preparation
• Bihar Board 10th, 12th Exams 2026: Dates Released, Check Time Table at biharboardonline.bihar.gov.in
• Bihar Board Class 12 model papers 2026 released for intermediate annual exam
• Bihar Board Class 11 Quarterly Exam 2026-27: schedule released for September 19-27