Hello I am little confused I have to give 12th exam in March 2018 and has commerce stream wn how 2 apply online for BCOm or good course
Which state and which place do you belong to? As for B.Com, the application process depends upon the college you will apply to and the University it is affiliated to. Check which colleges near your place offer B.com and call them up. They will tell you the procedure. As for online, I wouldn't advise doing any online course unless you have compulsions or are working.
I would advice that you look into professional courses along with B.Com like Chartered accountacy or cost accountancy to build your qualifications a bit more.
Write back if you have more doubts.