I start to collect study materials for NBEO part II. Anyone who has taken the part 2, please post your tips here. 
What is the preparation time/Estimated time required to prepare?
What materials used and number of times reviewed?
What are the suggested reference books [i.e., textbooks and review materials]
Any useful websites for the preparation.
Please feel free to add anything if necessary.
Thanks!🙂

What is the preparation time/Estimated time required to prepare?
What materials used and number of times reviewed?
What are the suggested reference books [i.e., textbooks and review materials]
Any useful websites for the preparation.
Please feel free to add anything if necessary.
Thanks!🙂