Ca final book for idt may 2013

My friends suggest BANGAR for IDT ca final.

but i came accross another book, which is Simplified approach to IDT

https://www.cchindiastore.com/tax/taxation-cross-border-services-radhakishan-rawal/p-14314-89001193410-cat.html

Just wanted to know views of anyone, who has bought the earlier edition of this book

its by raja sekhar

Am confused, coz it has a coverage for ca, cs and cwa

and i think that could confuse.

If one can help, would be great