Hello,

If you have taken a CBSE improvement exam and there is no explicit option to indicate this on the JEE Advanced application form, you should proceed by entering the details of your original CBSE board exam, including the year of passing and marks obtained. Alongside the application, you may need to submit supporting documents, such as a copy of your admit card or mark sheet indicating your appearance for the improvement exam. In case of any uncertainty or if you require further clarification, it's advisable to contact the JEE Advanced exam authorities directly

Hope this helps,

Thank you