Which all competitive exams can I write to pursue computer science?

The only option can be to try to get via management quota in some good and reputed college, with good prospects. Management quota can always deliver you a seat without any criteria, so go for that. And along that, as you say, if you are keen on CS, then go on learning about CS stuff, like algorithms

Hey Eleti, Dont lost hope as u lost all xams but still u can chose your profession as btech in CS it willbe beneficial for u Thank you and keep asking.