IISER Syllabus 2026: Subject-wise IAT Topics and PDF Download

IISER 2026 syllabus is set for the IISER Aptitude Test (IAT), the entrance exam for the five-year BS-MS dual degree at the seven IISERs, plus select programmes at IISc Bengaluru and IIT Madras and Guwahati. It covers four subjects, Physics, Chemistry, Mathematics and Biology, based on the NCERT Class 11 and 12 curriculum but tested with more analytical depth than the boards. Aspirants preparing for IISER can use this page to check the subject-wise topics, the marking scheme, high-weightage areas and the official PDF

IISER Syllabus 2026 Highlights

IISER 2026 syllabus sits at the Class 11 and 12 level, so most of it overlaps with what JEE and NEET aspirants already study, though IAT questions lean more on concept application than either exam. The four sections carry exactly equal weight, which is unusual among national entrance tests and changes how preparation time should be split. The table below covers the basics before the subject-wise topics.

IISER 2026 Section Structure and Compulsory Subjects

IISER IAT question paper always consists of all four sections, but a candidate does not have to answer every one of them to be considered for an IISER seat. This flexibility is one of the most searched and most misunderstood parts of the exam, since the rules differ slightly depending on which institute a candidate is targeting.

Every candidate needs to have studied at least three of the four subjects in Class 12 to be eligible, and attempting all four in the exam is recommended since it raises the total score used for IISER's own merit list. Physics, Chemistry and Mathematics become compulsory only for the IIT Madras, IIT Guwahati, and IISc Bengaluru routes; a PCB student without Mathematics can still apply to IISERs directly but not through those three additional routes.

IISER Physics Syllabus 2026 and Weightage

IISER Physics syllabus 2026 is based on NCERT Class 11 and 12 Physics and carries 15 questions in the IISER Aptitude Test. Although the topics closely follow the NCERT curriculum, the questions generally test conceptual understanding and analytical application rather than direct theory.

IISER Chemistry Syllabus 2026: Physical, Organic And Inorganic Topics

IISER Chemistry syllabus 2026 covers Physical, Organic, and Inorganic Chemistry from the NCERT Class 11 and 12 curriculum. The section carries equal weight in IAT and includes both conceptual and numerical questions across all three branches.

IISER Mathematics Syllabus 2026: High-Weightage Chapters

IISER Mathematics syllabus 2026 includes topics from Algebra, Calculus, Coordinate Geometry, Trigonometry, Statistics, and Probability. Mathematics is compulsory only for candidates seeking admission through the IIT Madras, IIT Guwahati, and IISc Bengaluru admission routes.

IISER Biology Syllabus 2026 and Important Topics

IISER Biology syllabus 2026 covers NCERT Class 11 and 12 Biology and includes topics from Cell Biology, Human Physiology, Genetics, Evolution, Ecology, Biotechnology, and Plant Physiology. Biology is optional for many PCM candidates applying only to IISERs.

IISER Syllabus 2026 vs JEE Main and NEET Syllabus

IISER IAT syllabus overlaps closely with both JEE Main and NEET, since all three are based on the same NCERT Class 11 and 12 base, but no single one of them prepares a candidate fully for IAT on its own. A JEE aspirant already has Physics, Chemistry and Mathematics ready but usually needs separate Biology preparation, while a NEET aspirant has Physics, Chemistry and Biology but often needs to build up Mathematics from a lighter base.

The difference candidates report most is depth rather than topic list: IAT questions are generally considered less calculation-heavy than JEE Advanced but more conceptually layered than a typical NEET question, closer in style to JEE Main. A candidate preparing seriously for either JEE or NEET already covers a large share of the IAT syllabus and mainly needs to add the missing fourth subject and adjust to IAT's equal-weightage, all-four-subjects format.

IISER Important Topics and Weightage 2026

IISER does not publish official marks by chapter for IAT, so the notes below reflect how past papers have distributed questions rather than a confirmed weightage table. Since all four sections carry identical marks, the more useful question is which chapters within each subject repeat most often across past years.

Since every section is worth the same, a candidate attempting all four gets the most benefit from being reasonably strong across all of them rather than exceptional in just one, given how the total score is added up rather than sectioned off.

IISER Best Books 2026 for IAT Preparation

IISER Syllabus 2026 is based on the NCERT Class 11 and 12 curriculum, making NCERT books the primary resource for preparation. Once the syllabus is completed, candidates can refer to standard books for concept-building and additional practice.

IISER Preparation Strategy 

Preparing for the IISER Syllabus 2026 requires consistent revision and conceptual understanding across all four subjects. Since each section carries equal weight in the IAT, a balanced preparation strategy is more effective than focusing on a single subject.

IISER 2026: IAT as the Only Admission Channel

IISER admission has been conducted through IAT alone since 2024, with no separate or alternate entrance route into any of the seven IISERs. Earlier some IISER seats were reachable through channels like KVPY, but that route has closed, so the syllabus and pattern covered on this page apply to every IISER applicant without exception. This also means preparing for a defunct alternate channel wastes time that could go toward the actual IAT syllabus.

IISER 2026 Safe Score by Campus

Unlike NEST's best-of-three scoring rule, IISER 2026 safe score counts every section a candidate attempts, so there is no dropped-subject buffer here. Since different IISER campuses close at very different scores, knowing where a target score falls matters as much as the syllabus itself.

General category candidates typically need 130 or more out of 240 just to qualify, while SC and ST candidates have qualified in past cycles around 65 to 75, so the qualifying bar and the safe-score bar for a specific campus are two different numbers worth tracking separately. A candidate targeting Pune or Kolkata specifically should treat 150 as a working minimum rather than the bare qualifying score, since the qualifying bar alone rarely secures a seat at the most competitive campuses.

IISER IAT 2026 Duration for PwD Candidates

IISER IAT is held for 3 hours for most candidates, but PwD candidates with at least 40% disability get an additional hour, bringing their total exam time to 4 hours. This compensatory time applies uniformly regardless of which sections a PwD candidate chooses to attempt, and it is granted automatically based on the disability certificate submitted during registration rather than needing a separate request closer to the exam date.

IISER IAT 2026 Difficulty by Section

IISER IAT 2026 was held on June 7, and early candidate feedback rated Physics and Mathematics as moderate, while Biology and Chemistry came in moderate to difficult. Class 11 topics also carried more weight in this cycle's paper than in some previous years, according to test-taker reports gathered right after the exam.

This kind of year-to-year shift is normal for IAT and is not something a candidate can plan around precisely, but it does mean that leaning too heavily on assumptions from two or three-year-old papers can be misleading for how a specific cycle plays out. A candidate preparing from recent papers rather than older ones tends to get a more accurate sense of current difficulty trends.

IISER Syllabus 2026 PDF Download

IISER releases the official IAT syllabus PDF through the admission brochure every year. Candidates should download the latest brochure from the official admission portal to verify the complete subject-wise syllabus before beginning their preparation.

• Open iiseradmission.in and go to the Aptitude Test section.
• Click on the Syllabus option to view or download the PDF.
• Save the syllabus PDF for reference during preparation.

IISER Syllabus 2026 FAQs

Ques: Is the IISER IAT syllabus different for the BS-MS, BS, or BTech programmes?

Ques: Can an IISER IAT score be carried forward to the next year?

Ques: Does the IISER IAT syllabus differ by campus?

Ques: Has the IISER 2026 syllabus changed from previous years?

Ques: Is there a sectional cutoff in IISER IAT 2026?