Computer Science and Engineering

Yes, you will definitely get the CSE group in Gayathri Vidhya Parishadh. Moreover, you also get Sri Venkateswara University Tirupati.

List of popular B.Tech colleges accepting WBJEE scores are mentioned at the link provided below:
https://www.shiksha.com/b-tech/articles/list-of-popular-colleges-accepting-wbjee-scores-blogId-10707.

CGPET 2018 College Predictor
Use your CGPET 2018 rank to see where you can get admission at the link provided below:
See the courses, colleges & rounds you may crack
The result is based on admissions data of CGPET 2017
Get resources & insights on colleges & courses
https://www.shiksha.com/b-tech/resourc

In BIT Durg, you need a rank under 250 to get computer science stream while in college Rungta, you need to score under 1000 to get computer science.

Your rank is good and you can get NITs in this rank. Go for the link below to find the Colleges of your choice and Branch:
https://www.shiksha.com/b-tech/resources/jee-mains-college-predictor#.

Both branches are good and with any of branch you will work in it sector. To clear your confusion, I am sharing a link which will describe you the comparison of both m and you will get to know your answer. So, go through the link. https://www.shiksha.com/b-tech/articles/comparison-between-engineerin