Hello aspirant

hope you are doing great. As per your query  I would glad to tell you that you can start your carreer in computer science if you didnt have maths in your 12th class . You can go for bca course which requires only 50 percent only in class 12th . So yes you can go with bca course but I will strongly suggest you to do mca as only bca wont get much opporunities in IT sector

Hope you found this answer helpful. Good luck for your future