Hello,

there are lots of books available to prepare BHU BCom. Better to follow the prescribed books in the syllabus by the BHU. you can get the syllabus from the BHU official site and you can download it. it is freely available.

Apart from there are many books available for the preparation. you can also get the old papers from the oldquestionspapers site.  You get some from the bhuonline site too.

there are many resources available to read and get the concepts.

Hope it helps you!