Dear aspirant !

Hope you are doing well !

If you are getting 100 marks in jee main then means you will get around 90 percentile,this is valid for first attempt as in second attempt competition will be increased . At this percentile you will get only lower nits which is not so good . I will suggest you to work harder in the upcoming April attempt of jee.  Otherwise you have to be satisfy with lower nits and lower branch . Chemical engineering is also tough getting at this score .

For your rank ,we have rank predictor,please visit it once ;-

https://www.google.com/url?sa=t&source=web&rct=j&opi=89978449&url=https://engineering.careers360.com/jee-main-rank-predictor&ved=2ahUKEwi8xvae9IeEAxUnkVYBHZRUA0IQFnoECBcQAQ&usg=AOvVaw2QNQ0E4U1hgytKWWo9jfZm .

Hope it helps you !!

Thanking you !