Hi Ramesh, hope you are doing well, let me tell you frankly that you have very high rank in number so you can not get cs in any of the iits or nits even though you are of reserved category. I suggest you go for private colleges which are good at both placements and academics. To know more about the admissions through jee mains once go through the rank predictor in jee mains in careers, the link is provided below, kindly go through it

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

I think it helps you!!!

Keep Smiling:)

Wish you good luck!:)