Hi Apurva,
You can easily get Allahabad University Entrance exam previous year paper for B.Com (//B.Com) course by simply searching on google and you'll find that there are many sites are available wherein you can get the papers.
Also you can visit the following link for more details of exam pattern:
https://university.careers360.com/articles/allahabad-university-exam-pattern
Good Luck
Regular exam updates, QnA, Predictors, College Applications & E-books now on your Mobile