Yes, you are eligible for JEE Main 2025 if your Class 12 marksheet indicates "Session Annual Regular 2023."

The eligibility criteria for JEE Main generally require candidates to have passed Class 12 or its equivalent with Physics, Chemistry, and Mathematics as subjects. The specific session or board you appeared for is not a determining factor.

As long as you have completed your Class 12 education in 2023 and have obtained the required marks in the specified subjects, you meet the basic eligibility requirements for JEE Main 2025.

However, it's important to check the official JEE Main information brochure for any specific eligibility criteria or guidelines that may have been introduced for the 2025 exam. Additionally, ensure that you have all the necessary documents, such as your Class 12 marksheet and identity proof, ready for the application process.