There would be approx 100 students scoring the same percentile. So how the rankings will be given in order to be eligible for advance??

Hii

In JEE Mains, when two or more candidates obtain equal Percentile Scores then tie breaker wouldl be as follows

• Candidates who obtain high Percentile Score in Mathematics will be ranked higher.
• If percentile of Maths is same then , Candidates who obtain higher Percentile Score in Physics will be ranked higher.
• Even if the tie remains then, Candidates who obtain Percentile Score in Chemistry will be ranked higher
• If still the tie is not resolved then, the candidate Elder in age will be ranked higher
• In case the tie is still unresolved, the same rank will be given to the candidates

You can refer to following link for more details.
https://engineering.careers360.com/articles/jee-main-normalisation-process-how-scores-are-calculated

Hope this helps
Thanks!!