How to Prepare for IAT 2026 in 15 Days: Complete Plan & Resources

How to Prepare for IAT 2026 in 15 Days: Preparing for NEST 2026 in just 15 days is challenging but possible for those candidates who understand the Physics, Chemistry, Biology qaqand Maths concepts of the NCERT Class 11 and Class 12 syllabi.

The preparation requires a strategic approach that includes revising important topics, solving previous years' questions (PYQs), and practising questions from high-weightage topics.

This SciAstra blog explains the strategic approach to prepare for IAT 2026 in 15 days, covering the methods mentioned above and resources that can boost the preparation.

Important Points about IAT 2026

Aspirants must note that preparing for the IAT in such a short time is only feasible if you already grasp the most important concepts from your Classes 11 and 12 chapters. That is your reality check.

But you do not need to be disappointed because the strategies provided here can be useful to a great extent.

Your final success depends on your dedication. Use this preparation strategy to maximise your efforts.

Before starting the preparation, you need to know the following important points about IAT 2026:

• The IISER Aptitude Test (IAT) 2026 will be conducted on June 7, 2026 from 9 AM to 12 PM in Computer-Based Test (CBT) mode for admissions to BS-MS, BTech and BS courses offered by IAT participating institutes. `

• The question paper of IAT 2026 will be based on Physics, Chemistry, Biology, and Maths topics from the Class 11 and Class 12 NCERT syllabus.

• It will contain objective-type questions that must be solved within 3 hours.

• There will be 15 questions from each subject (PCMB) in the question paper, making the total number of questions 60.

• For each correct answer, test-takers will get +4 marks. For each incorrect response, 1 mark will be deducted.

How to Prepare for NEST 2026 in 15 Days?

To prepare for IAT 2026 in 15 days, candidates must follow a focused and structured preparation plan. This plan must include effective strategies and avoid methods that waste time.

The detailed preparation plan for IAT is mentioned below:

Day 1-8: Learn and Revise High-Weightage IAT Topics

• To begin with the IAT 2026 preparation, candidates must start clearing concepts related to the high-weightage topics in the IAT 2026 syllabus. The syllabus is based on NCERT’s Classes 11 and 12 for PCMB.

• The most important topics for Physics, Chemistry, Maths, and Biology are Electricity, Physical Chemistry, Differential Calculus, and Molecular Biology, respectively.

• Download the PDF provided below to check all the most important topics for IAT 2026. These topics have been identified after reviewing IAT’s previous years' question papers from 2017 to 2025.

• Once you know all the important topics, make notes of them and revise them.

• Do not spend your time learning low-weight topics.

Revise NEST 2026 Topics With IAT

To help you revise PCMB topics for IAT 2026, SciAstra will conduct online sessions called "Maharevision".

The first session will be live on May 26, 2026, on the official SciAstra YouTube channel.

The link to access the SciAstra Maharevision sessions will be provided below.

IAT 2026 Important Topics

SciAstra also provides the list of top 50 questions for each of these subjects: Physics, Chemistry, Maths and Biology.

The video lectures for all these courses will be provided below once they are released:

Day 9-12: Solve IAT Previous Years’ Question Papers

• Many IAT questions are repeated from previous years’ papers; therefore, the best resource to prepare in 15 days is to practise PYQs.

• To access all IAT PYQs in one place, with detailed video solutions for each question, refer to the SciAstra IAT PYQ Book (2018-2025).

• The details about the book are mentioned below:

Day 13-15: Take IAT Mock Tests

Mock tests for IAT or any other entrance exam are the best resource, as they help you understand the types of questions asked and the overall structure of the question paper.

Therefore, to prepare for IAT, you must take mock tests.

If you do not know where to get the best mock tests, check out SciAstra’s IAT & NEST 2026 Crash Course available for IAT, NEST, and IAT + NEST (Combo). The crash course includes mock tests for IAT and NEST.

It includes the following features:

• Live revision sessions (Mon–Sat)

• 12 IAT Mock Tests

• 12 NEST Mock Test

• IAT & NEST PYQs (2018–2025)

• Daily problem-solving sessions (8 PM–10 PM)

• Personalised mentorship (only for the personalised crash-course batch)

The SciAstra IAT & NEST crash courses are available in two languages: Hinglish and English. Check out the links below.

Note: The SciAstra IAT & NEST 2026 crash course is valid until IAT 2026 (June 7, 2026) and NEST 2026 (June 6, 2026).

Conclusion

Preparing for IAT 2026 in just 15 days may seem challenging, but with the right strategy, focused revision, and consistent practice, you can significantly improve your performance.

The key to success in the exam is to prioritise high-weightage topics, strengthen your NCERT concepts, solve previous years’ question papers, and regularly attempt mock tests to analyse your preparation level.

Avoid wasting time on unnecessary resources or low-priority topics. Instead, stay disciplined, follow a structured timetable, and make smart use of revision sessions, PYQ books, and mock tests to prepare well for the exam.