General Cardiology Boards
The exam is two days, where second day is imaging interpretation (ECGs, echos, cath).
For boards format and content break down: ABIM blueprint
Review your prior ITE exams for strong/weak categories
There are Mayo videos for general cardiology boards
Study using ACC SAP for practice questions (no longer have access after you graduate)
Practice ECG source to practice coding (and not overcoding): ECGsource - Cardiovascular Disease Board Exam Imaging Review & Continuing Medical Education
Also review echo and cath images