You can attempt the JEE Advanced exam  maximum of two times in two consecutive years. This rule also applies if you did not take the exam in the year you completed your 12th grade. If you skip the first attempt in your 12th grade year, you can only appear for the exam once, in the following year (your drop year).

You can give JEE Advanced only 2 times in the two years right after your 12th. If you did not attempt it in your 12th year, you still get the next two years. For example, if you pass 12th in 2025, you can try in 2026 and 2027.