The initial step in the IISER Aptitude Test (IAT) selection process involves completing the online application form. Candidates must visit the official IISER admissions website and register by providing their basic details, including name, contact information, and educational qualifications. After successful registration, candidates need to fill out the detailed application form, ensuring all information provided is accurate and verifiable. This includes uploading scanned copies of required documents such as mark sheets, identity proof, and category certificates (if applicable). Finally, candidates must pay the application fee through the online payment gateway to complete the application submission. It's crucial to adhere to the specified deadlines and guidelines to avoid rejection of the application.

Once the application process is complete, the next crucial step is downloading the admit card. IISER releases the admit cards on its official website a few weeks before the exam date. Candidates are notified via email and SMS regarding the availability of the admit card. To download it, candidates need to log in to the admission portal using their registration credentials. The admit card contains essential details such as the candidate's name, roll number, exam center address, exam date and time, and important instructions. It is mandatory to carry a printed copy of the admit card along with a valid photo ID to the exam center. Without the admit card, candidates will not be allowed to appear for the IISER Aptitude Test (IAT).

The IISER Aptitude Test (IAT) is a crucial stage in the selection process. Candidates must appear for the exam at the allotted exam center on the specified date and time. The IAT assesses candidates' knowledge and understanding of Physics, Chemistry, Mathematics, and Biology. The question paper typically consists of multiple-choice questions (MCQs) designed to test analytical and problem-solving skills. Candidates should arrive at the exam center well in advance to complete the necessary formalities and familiarize themselves with the exam environment. It is essential to follow all the instructions provided by the invigilators during the exam. Candidates should manage their time effectively to attempt all the questions accurately. Performance in the IAT plays a significant role in determining the candidates' eligibility for admission to IISERs.

After the IISER Aptitude Test (IAT) is conducted, IISER evaluates the answer sheets and declares the results on its official website. Candidates can check their results by logging in to the admission portal using their registration credentials. The result typically includes the candidate's score, rank, and qualifying status. IISER also releases a merit list of candidates who have qualified for the counseling process. Candidates who have secured the minimum qualifying marks are eligible to participate in the subsequent rounds of seat allocation. The result declaration marks a significant milestone in the admission process, determining the candidates who will proceed further towards securing a seat in one of the IISERs. Candidates should regularly visit the official website for updates and announcements regarding the result declaration.