JEE Advanced Eligibility

No, as a foreign national, you do not need to qualify JEE Main to be eligible for JEE Advanced. However, you must meet the other eligibility criteria specified in the Information Brochure of JEE (Advanced) 2025, such as educational qualification and age limit. Additionally, you must register directly for JEE (Advanced) 2025 without appearing for JEE (Main) 2025.

Yes, you are eligible for JEE 2024 if you are in the top 20 percentile of your respective board. According to the revised eligibility criteria, apart from their All-India rank in JEE-Main, a student should either have scored 75% and above in Class 12 board exam or figured among the top 20 percentile candidates of the respective board.

In this question, you didn't mention about the category you belong, if you belongs to general category, then my answer to this question will be No. If you belongs to other category, then you are eligible for giving exam. 

Yes, you are eligible for IITs if you belong to the SC category and qualify the JEE Advanced even if you have less than 75% in your intermediate boards. 

Yes, you are eligible fo JEE. Even I'm repeating class 12th. Don't worry