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Hi Pranav,
With your JEE main score, you can expect a rank between 16701 and 19600.
In reference to your question, to pursue BTech / BE in CS it is not necessary to have studied CS while in school.
To get the details of colleges that may choose to offer you seats with the expected rank are:
-CSE
1. National Institute of Technology, Shillong
2. ndian Institute of Information Technology, Design & Manufacturing, Kancheepuram
3. Indian Institute of Information Technology, Guwahati
4. J.K. Institute of Applied Physics & Technology, Department of Electronics & Communication, University of Allahabad, Allahabad
5. National Institute of Technology, Patna
-ECE
1. National Institute of Technology, Silchar
2. National Institute of Technology, Patna
3. National Institute of Technology, Rourkela
4. National Institute of Technology, Goa
5. Indian Institute of Information Technology, Chittoor
-Mechanical
1. National Institute of Technology, Patna
2. National Institute of Technology, Hamirpur
3. National Institute of Technology, Pauri
4. National Institute of Technology, Silchar
5. Indian Institute of Information Technology, Design & Manufacturing, Kancheepuram
For more details of colleges, kindly refer the link below:
https://www.shiksha.com/jee-mains-college-predictor
Kindly filter out the branches that you wish to pursue from the above link.
Hope this information helps. Please feel free to revert. Click on the thumbs up or mark it as the best, if you found this useful.
Wish You Luck!