| Application Portal Opens | March 10, 2025 |
| Application Portal Closes | April 15, 2025 |
| Corrections in Application Forms | 10:00 AM, April 21, 2025 - 5:00 PM, April 22, 2025 |
| Release of Hall Tickets | 3:00 PM, May 15, 2025 |
| IISER Aptitude Test (IAT) 2025 | 9:00 AM to 12:00 Noon, May 25, 2025 |
| Answer Key Display | May 25, 2025 (after the IAT 2025) |
| Candidate Response form upload & Portal opens for filing Objections | 5:00 PM, May 29, 2025 |
| Portal closes for filing Objections | 5:00 PM, June 01, 2025 |
| Selective Information/Document Upload in Application Form | 10:00 AM, June 01, 2025 - 5:00 PM, June 23, 2025 |
| Release of Final Answer Key | June 24, 2025 |
| Declaration of IAT 2025 Result | June 24, 2025 |
| Registration for Counselling Process (filling up of IISER Academic Programme Preference Form) | 5:00 PM, June 26, 2025 - 5:00 PM, July 03, 2025 |