MRCP (Member Royal College of Physicians) UK - Part 1 experience:
Straightforward exam with 1-2 tier questions.
Way much easier then Step1 USMLE.
Do passmedicine.com MRCP part 1 question bank x 2
Do bmj onexamination question bank x 1
No need for any book or notes resources.
Just have a good read from the explanation of both the question banks.
-Focus less on speciality fields like psychiatry, derma, ophtha, ENT and more on core medicine like cardio, pulmo, endocrine, GI, neuro etc.
Prior prep for USMLE/PLAB helps great deal!
Needed study time around 3-4months..depends on how many mcq's you can solve / day.
All the best, and will be glad for any assistance