Compartment & supplementary exams explained: your second chance, board by board

What is a compartment / supplementary exam?

A compartment or supplementary examination is a second-chance exam held for students who did not meet the passing criteria in one or more subjects during the main board examination. Instead of repeating the entire year, candidates can clear the pending subject(s) in this separate exam, typically held a few months after the main results. The term 'compartment' is used across some boards (most commonly CISCE, NIOS and northern/central state boards), while 'supplementary' is the preferred term in states like Maharashtra and Tamil Nadu — both refer to the same concept. The exam lets you secure a pass without losing an academic year.

Who is eligible: failing the permitted number of subjects

Eligibility for a compartment or supplementary exam depends on how many subjects you failed in the main examination and your board's specific rules. Generally, a candidate placed in 'Compartment' by the board — meaning they fell short in the qualifying marks (usually 33%) in a limited number of subjects — becomes eligible to appear. The exact number of subjects permitted varies:

For CISCE (ICSE and ISC): typically one or two subjects, as specified in the result notification.

For NIOS, UP Board, MP Board, Bihar Board, Rajasthan Board and other state boards: usually one to two subjects in the permitted category.

For Tamil Nadu and some other boards: rules may differ; some allow appearance in any failed subject irrespective of the number.

• You must have been formally placed in the 'Compartment' or 'Supplementary' category by the board — not every failed subject automatically qualifies.
• If you fail more than the permitted number of subjects, you will usually have to repeat the year instead.
• Subjects with both theory and practical components may have separate eligibility — if you failed only the practical, you may retake only that component (CISCE carries forward the practical marks from the main exam to the supplementary).

Compartment vs improvement vs repeating the year

Three paths are available to students who do not pass the main exam, and understanding the difference is crucial:

• Compartment/Supplementary — for candidates who failed in the permitted number of subjects (usually 1–2). Clearing the compartment exam changes your result from 'Compartment' to 'Pass', and you move on to the next class.
• Improvement exam — ONLY for students who have already passed. You retake one or more subjects purely to boost your marks and receive a new statement of marks; you do not change your pass status. (Offered in most boards; CBSE allows this for Class 12 in the year after passing.)
• Year repeat — if you failed in more subjects than your board permits for compartment, you must repeat the entire year and sit the main exam again the following year.

When second-chance exams typically happen, board by board

Always verify the exact dates, application windows and fee amounts on your board's official website or notice, as they change annually and may vary by subject.

• CISCE (ICSE/ISC) — supplementary exams are usually scheduled in July–August following the main exam (held March–May). The official notification lists the precise dates and subjects offered.
• NIOS — uses its on-demand examination system, allowing candidates multiple windows throughout the year (typically April–May and October–November sessions for regular exams, with supplementary windows announced per the annual calendar).
• Maharashtra Board (SSC & HSC) — supplementary exams typically run in June–July for Class 12 (HSC) and Class 10 (SSC), a few weeks after the main results.
• MP Board, UP Board, Bihar Board, Rajasthan Board — supplementary exams generally fall in May–June, shortly after the main February–March exam cycle.
• Tamil Nadu (SSLC & HSE) — special supplementary exams are held in June–July, after the March–April main examinations.
• West Bengal (WBCHSE) — supplementary exams follow the main exam cycle; exact dates are notified by the board annually.
• Karnataka (SSLC & PUC) — supplementary exams are typically held in June–July following the annual March–April exam.
• Gujarat, Andhra Pradesh — timings vary; check the official board notification each year, as supplementary schedules may shift.

Compartment & supplementary exam FAQ

Q: Can I take an improvement exam and a compartment exam at the same time?

A: No. Improvement is only for students who have already passed the main exam. If you are in compartment (meaning you failed), you must first clear the compartment exam; once you pass, you are no longer in compartment and may be eligible for improvement in the future if your board allows it.