hi,

see your 12th score is average. since you are interested for coding you should select b.tech in computer science or IT or bachelors of computer applications . however after completing bca you may work as a web developer or software analyst positions. now coming to bca course many of the institute has specialization like bca with cyber security or data science etc. however any of the stream you may choose there would be ample opportunity to learn coding. another thing is to become a high skilled professional you have to learn the programming language apart from your syllabus. todays industry a skilled professional has more priority then a high scorer at college or  academic level.

however you may take admission in bca course by selecting the best institute which has excellent placement record as per your convenience. however keep doing the online courses and your coding practices as it is.

hope it would help.