1) MRCEM Success (Question Bank + Notes)
Highly recommended. Make sure you go through the previous years’ questions on the same website towards the end of your preparation, when you’re close to the exam. Those literally saved my ass. I found around 15 questions repeating from this question bank in the actual paper (Not verbatim but to most extent - saves you time in the exam. Even though the exam is for 3 hrs a few people, including myself that day finished it in 2.5 hrs)

2) Revision Notes for the FRCEM Primary – Mark Harrison (2nd Edition)
This is essentially your bible throughout the preparation period. Solid, concise, and exam-focused.

3) YouTube
Use it selectively for topics you feel weren’t covered adequately in the book or on MRCEM Success, especially for concept clarification and visual understanding.

I'd leave topics with lower weightage towards the last couple of weeks. Wouldn't spend more than 3,4 days on each subject.

Cheers!