hey,

i hope you are doing well ,see both B.Com (//B.Com) and BCA are under graduate course can be pursued right after completing 10+2 , B.Com (//B.Com) consist of concepts like statics, management , accounting , income tax and much more whereas BCA is computer application oriented course , in this you will learn about different computer languages like C, C++ , python , java , SQL and many more, these two are completely different from each other in terms of concepts and everything

hope this helps

all the best!