hello aspirant,

see there are various books available on market. however I would suggest you to make good concept of all subjects which you are studying in bca course. for appltitute you may follow rs agarwal. which is the bible for apptitude test. there are numerous free test series available on internet. give exams to score more in final exam. for study main course of mca entrance follow any of the below mention books,

Excel With Objective Book For NIMCET By J B Dixit, Ruchi Sharma, Ashish Mangal

Arihant MCA Entrance Test (Self Study Guide) By Amit M. Agarwal