It depends on what is your B.Sc degree is  about.
You must have studied for the degree for 3 years and have some knowledge about it.
If not so, go revise the syllabus for 3 years on your subject.
You have no other option.
And they will ask not much related to your curriculum.
And the PI is more about opening up and talking to them in a very casual and chilled out way.
You can't prepare for PI.
You just have to bring out your real character in the CAT PI.
So just don't be nervous and do your best.
Hope this helps.
Best of luck.

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