hello,

For IPU CET  you need  to clear your basics first for any entrance exams as in CET for BCA you need to work on your basic mathematics,general knowledge,english and computer fundamentals .as these are technical subjects work on logics and basics.Try to solve sample papers and judge yourself without biasness and work on the weak points .try to solve questions yourself first for at least 10 times and then go for solution.for solving questions you can go with any of bca entrance exam books all are good (no book is bad)for reference you can prefer ARIHANT'S  BCA ENTRANCE EXAM BOOK available online stores .work on your maths from 10th class basics .And computer basics too.You have IP in 11th and 12th so work on that too

focus more on understanding and learning then mugging up logic's.

be confident and read,think ,understand and evaluate then answer the question ,first go for strong areas to answer.

all the best hope this will be help you