Hii Arun,

BCA is software development field so for its entrance you must know some basic knowledge about it like networking ,database management system, C and C++ programming ,etc. You can go through the syllabus and according to the topics  you can refer basic textbooks of Computers science of 11th and 12th std science stream and for other topics such as mathematics ,English ,etc you can go with your school textbooks by just doing those topics which are in the syllabus. For logical reasoning and aptitude ,I think RS Agarwal aptitude book is good so you can go for it or also you can refer it online as its application is also available on playstore.

Best of luck!!