B.Tech Ranking

You can't get government colleges as your chances are very very low. You can get a good private engineering college in your city/town or state. It depends on your JEE marks and your category as well. Fill the JOSSA admission form properly. Do the research on engineering colleges in your City/ State or Cities like Pune and Maharashtra which have some really good colleges.

Please mention the examination or the college/university name for which you have appeared and got a rank of 35000. It is diffident to answer your question right now due to insufficient information.

Follow the link below:
https://www.resonance.ac.in/reso/news/JEE-Main-Branch-Predictor.aspx

Hello Rudra,
Please follow this link for college details as per your score in JEE Mains.
If you like the college then you should go for counseling. https://www.shiksha.com/b-tech/resources/jee-mains-college-predictor

Hello Arghya,
Your rank of 84K is quite enticing. It's in zone where everything depends on how others apply. You seem to have reasonably ok chance. I am attaching a link that will predict college for you.
https://www.resonance.ac.in/reso/news/JEE-Main-Branch-Predictor.aspx

Firstly, you cannot get in NIT or any IIIT with this rank. So, it is better to try for any other university or you can take a gap of one year. With this rank, you may got very reputed private universities. So, I tried to attend JEE Mains counselling.

First, see your rank itself! Listen, to get a college is not a big deal but which college you are wants to choose? Is the question. Have you given WBJEE? You can take a gap of 1 year or via Management Quota you can take admission. Or, you can pursue BCA, B.Sc, Polytechnic in a reputed college.

First search out the companies of any sector in which you are willing to work. Then, take a look of what are the requirements they have been put there to recruit a person. I am sure you will get your answer then what to study along with your B.Tech in CSE.