Hello Abhishek,
According to the rules, you can give JEE Advanced only twice. You first attempt would be considered the one in the year you appear for Class 12th boards and your second attempt would be considered in the year just after the year you appeared for your first attempt. So if you have given Class 12th boards in year 2018, it doesn't matter whether you appeared for JEE Advanced or not, you would be having only one further chance to attempt in JEE Advanced and that further chance acn be attempted in year 2019 where you got another result from your improvement examination. Well, you clearly can not appear for JEE Advanced in year 2020. Also you must note that you must have an aggregate of 75 percentage in your CBSE Class 12th boards or you should be in top 20 percentile of your respective boards.
I hope I cleared your doubt. For any further queries, ask me in the comments.

Joint Entrance Exam Advanced

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