Idt - case laws

Hi,

I am currently in the middle of preparing for IDT. I am appearing in coming Nov.

I am preparing using Bangar. I observed that there are many case lawa in Bangar while comparatively few in Select Case Laws books issued by the ICAI.

I want to know as a trend, does ICAI ask case law based questions generally from the case laws it has issued in the select case laws book and the RTP or it can be form outside also.

If someone has examined this, it would be very helpful.