Your choice clearly reflects your confusion and it may be possible that you have decided to go for B.com. in haste without deeply thinking and knowing about the subject. Course of class 11th and 12th is very basic and extremely important for studying commerce. It is kind of nursery and first standard of education. You can imagine that if a kid has skipped nursery and first standard and directly introduced to the second standard where he has to read the sentences and write them without knowing what the alphabet is , he will find himself under immense pressure and inferiority because the task given to him is almost impossible for him to do. Same situation is with commerce. You don’t know the meaning of debit and credit and other important terms then how you will be able to solve difficult major problems considering the existing competition.
So think once again and if you think that you can cover the syllabus and learn all the things before taking admission in B.com. then please first learn the meaning of subject and matter of subject first with help of a teacher and then if you feel comfortable with the subject then surely go for it.