I found some good questions/answers regarding IMS here:
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What is the difference between SIBLINGS and TWINS in IMS-DB database
What is a database record?
What is the maximum number of segment types allowed for a single database?
Explain the processing modes available in ims db?
What do you know about MFS?
What information does a dbd contain?
What is an ims database?
Explain the advantage of creating the acbs well ahead of time?
How do you write a PSB code ?
I found some good questions/answers regarding IMS here:
What is meant by batch dl/i mode?
What are the ways to mapping external control block? a. ENTRY b. PROCEDURE DIVISION USING c. CALL ‘DLITCBL’ d. ALL ABOVE e. A & B