Hi,

If you have attempted JEE Mains in both 2020 and 2021, then your 2020 percentile will not matter for JEE Advance. The JEE Advance committee will only look out for the latest 2021 percentile, how you performed this year and not the previous year.

Good Luck!!

No not at all, you will not be asked about your previous score anywhere so you need not worry if you scored less. Just focus on your preparation and all the best for the examination. For admission for the year 2021-2022 through jee mains or jee advanced you will only be asked about your jee mains or jee advanced score for the year 2021. You should just fulfil the eligibility criteria of jee advanced,  your previous scores do not matter.