IISER IAT study guide
IISER IAT · Work through your exam, one topic at a time.
The IISER Aptitude Test (IAT) is the entrance examination used within the IISER Admissions 2026 cycle for admission to the Indian Institutes of Science Education and Research. It is aimed at students who have completed or are completing their higher secondary schooling and want to enter a research-oriented undergraduate science programme rather than a professional or engineering course. The test is an aptitude instrument spanning the science subjects a candidate has already studied, and the official site groups the exam material into four domains - Biology, Chemistry, Mathematics and Physics - so preparation has to be balanced rather than specialised. The official admissions portal publishes a dedicated Aptitude Test section covering important dates, eligibility (including a separate page for OCI/PIO/Foreign National candidates), schedule and fees, syllabus, a mock test, the answer key for IAT 2026 and the IAT 2026 results, and it also notes that IAT scores are used by other institutes. The IISER IAT study guide has 4 sections and about 1,073 words.
01IISER IAT Biology: Mechanism, Data, and Pedigrees
IISER IAT Biology questions are usually short data or scenario stems: a pedigree, a table of enzyme rates, a gel, an ecological census. You need to convert the stem into a mechanism.
266 words, about 1 min02IISER IAT Chemistry: Quantitative and Structural Reasoning
IISER IAT Chemistry mixes numerical physical chemistry with structural organic and periodic inorganic questions. For numericals, write a balanced equation, convert to moles, identify the limiting reagent, then carry concentration into equilibrium, pH, or electrochemistry.
266 words, about 1 min03IISER IAT Mathematics: Exactness and Domain Awareness
IISER IAT Mathematics is a speed-and-rigour paper: functions and domains, calculus, coordinate geometry, vectors, probability, matrices, and trigonometry. Most stems are designed so that a clean structural observation beats lengthy algebra.
258 words, about 1 min04IISER IAT Physics: Models, Signs, and Energy
IISER IAT Physics rewards choosing the right model before substituting numbers. Mechanics questions usually yield to energy or momentum conservation; circuits to Kirchhoff and equivalent resistance; optics to the lens/mirror sign convention; thermodynamics to the first law and process-specific work; modern physics to photon energy and conservation laws.
283 words, about 1 min