Hii!
Sorry, but you haven't mentioned or tagged relevant details such as specific subjects under b.com for which you seek the previous year question papers, name of the university or college etc.,
Kindly restructure your question and ask again including the necessary details. This will help us to answer your question well.
Also,you can check out for the previous year question papers on your respective college's official website or in the library or e - library you have access to it.
Hope you understand.
Good luck!