During your first day of college, just take 1 copy or diary with you. On the first day, you will get all the ideas about the subjects and what type of copy you are required to bring will be directed by your teacher. So don't buy now, if required you can buy 2 notebooks and take that to your college, within 1-2 days of college, you will get a clear idea from your teachers about the distributions of note books.

For more information regarding BBA consider the link below:

https://www.careers360.com/courses/bba-bachelor-of-business-administration

I hope this helps. Wish you a great eve!