B.Tech Computer Science and Engineering

It is not possible with your current JEE ranking. Moreover, you can get into them through their own entrance exam. Fill out their forms and crack that is the only way to get into them left for you.

There's just a small difference between the two in 7th and 8th sem in most of the universities.
A small hardware part is included along with Software in CSE, and IT includes only the software part. Hope you will understand. All the best.

Top Computer Science Engineering Colleges in Delhi/NCR are mentioned at the link provided below:
The ranking is based on engineering ranking published by The Week. https://www.shiksha.com/b-tech/ranking/top-computer-science-engineering-colleges-in-delhi/ncr/46-2-0-10223-0.

It's all on your interests. According to your marks, you can easily pursue B.Tech in IPU. But, if you have full faith that you can crack the next year IIT entrance exams, then only go for one year drop. Otherwise, if you have doubt then do not take a risk of one year. My suggestion is don't go for one year drop, pursue B.Tech in USIT, and then score good in college. All the very best.

https://googleweblight.com/i?u=https://www.shiksha.com/b-tech/resources/wbjee-college-predictor&grqid=S5rqbEdA&s=1&hl=en-IN
Please go to the college predictor link I am sharing to know the college you can get. Good luck.

You can try for Banasthali Vidhyapeeth. It's a good college for learning technology.

The chances are too low of getting BP Poddar College for B.Tech in computer science engineering (CSE) with the rank of 33172 in WBJEE 2018 but you can try through counselling. It is not fixed that you will get. Best of luck for your future and if any query feel free to ask.

https://www.shiksha.com/b-tech/resources/wbjee-college-predictor
Please go through the link that I am sharing here to know about the same.
Good luck.

Use your TS EAMCET 2018 rank to see where you can get admission in the link provided below:
See the courses, colleges & rounds you may crack.
The result is based on admissions data of TS EAMCET 2017.
https://www.shiksha.com/b-tech/resources/ts-eamcet-college-predictor