hey kanhav ,

colleges are not alloted based on marks but they are alloted based on ranking .

JEE mains 2019 markings and rankings are expected on 30 april 2019 ( tentative ).

until that you can check your approximate rank and college which you can get on careers360 JEE main rank predictor and college predictor.

click on the fallowing links to directly visit 

1. JEE main rank predictor https://engineering.careers360.com/jee-main-rank-predictor

2. JEE main college predictor https://engineering.careers360.com/jee-main-college-predictor

hope this helps.

good luck...!!!