Hi

As per last year cutoffs, with a rank of 8k you can get Mechanical Engineering at Bhilai Institute of Technology, Raipur; Chhatrapati Shivaji Institute of Technology, Durg; Rungta College of Engineering and Technology, Bhilai. 

Civil Engineering at Chhattisgarh Institute of Technology, Rajnandgaon.

Check this link to get a better idea about Previous Year Cutoffs in CG PET:  https://engineering.careers360.com/articles/cg-pet-cutoff.

Best of Luck.

Hope this helps.

Cheers!