Read more and more books because questions can be asked from anywhere right. I will enlist down below some of the most preferred general knowledge books -

1. General Knowledge book by Pearson
2. General affairs by Lucent
3. GK by Arihant Publications
4. Guide to General knowledge by Disha

Go through these books as mucch as possiblle and then you will have a decen exposure.

Refer to the site below for more details regarding same...

https://www.careers360.com/exams/ipu-cet

Best wishes. Thank you.