"The chapter on 'P Block Elements' is now divided into two parts: 'Group 13 to Group 17 Elements' and 'Group 18 Elements'. Also, the chapters on 'Coordination Compounds' and 'Environmental Chemistry' are now combined into one chapter."
https://www.home-tution.com/entrance-exam-jee-main-mathematics-syllabus

Year of Passing 12th Grade: Candidates must have completed their 12th-grade exams in 2023, 2024, or be appearing in 2025. Those who finished in 2022 or earlier, or are planning to appear in 2026, are not eligible to apply
https://www.home-tution.com/entrance-exam-jee-main-eligibility-criteria