With a Percentile of 99.4 in JEE Main, you may estimate your General Rank to be anywhere around 3-3.5k. Your corresponding OBC Rank may be anywhere around 500-1000. At this Rank you have high chances of securing CSE at one of the below institutes

NIT Rourkela, NIT Nagpur, NIT Calicut, NIT Allahabad, MNIT Jaipur, MANIT Bhopal, NIT Jamshedpur

The above institutes have good infrastructure, faculty as well as have excellent placements at par with NIT Trichy, Warangal and Surathkal.

For more information and college prediction do follow the link below