Advices for CHFI EC-Council

Hi investigators

After so time ago I got the opportunity to join to this forum, thanks for those people that make it possible. The issue is that I will do the certification exam for CHFI but I´m not sure if I can buy a guide to study or what do you recommend, I can´t take the course. Also I found an practice exam un Udemy ( https://www.udemy.com/computer-hacking-forensic-investigator-version-9-practice/) but I want to know if someone recommend it or if you have other idea it will be recieved.

I really appreciate your time an attention.

Cheers.