Hello aspirant
Jee advanced is a national examination conducted for admission's in different iits. It is considered as one of the toughest exam in world at 12th level.it is hard to predict marks required to be in top 100 rank as rank vary every year based on different factors.

Factor's affecting rank
1. No of seats
2. No of candidate
3.difficulty of paper
4. Past year trends.

Past year rank vs marks analysis 2019

1-346

10-310

40-45-280-285

80-90-273-279

200-230-250-270

490-500-227-249

600-650-217-225

720-780-210-216

800-820-208-209

990-1000-200-207

Past year trends for year 2016 2017 2018

Rank 1-320-339-337

Rank 101-246-305-272

You have to score above 260-270 to get rank below 100


You can refer this article to know more
https://www.google.com/amp/s/engineering.careers360.com/articles/jee-advanced-rank-list/amp

Hope this will help

best of luck.

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