Hello,
To score 80 percentile in the JEE Mains 2020 September session, you need to score around 55 to 70 marks out of 300. With this percentile your rank in the common rank list would be more than 150000. With this rank you won't be able to get any seat in any top government engineering colleges like NITs and IIITs. If you are from general category then you have almost no chances. If you have reservation category, then you might get some non core branches like food Technology, textile, biomedical in the newer NITs and GFTIs.
So please try to improve your score as much as you can. All the best. Jee mains September session will start from September 1 to 6, 2020.

For a detailed analysis of JEE Mains marks vs percentile, please visit this link https://www.google.com/amp/s/engineering.careers360.com/articles/jee-main-marks-vs-percentile/amp

Hope it helps

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