Hello Aspirant,
Here are some of the common books from which you can prepare for BCA Entrance Exams
BCA Entrance Exam Guide by R. Gupta
GGSIPUBCA Entrance Exam Guide by RPH Editorial Board
A complete Self Study Guide BAC by Arihant click here to order now
BCA Bachelor of Computer Application Entrance Exam by G. K. Publications
Hope this will help you.
Good luck

Please share which particular entrance you are asking for?