I found some good questions/answers regarding IMS here:
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Explain dbdgen process?
What is the maximum number of pcbs allowed in a psb?
What are two reasons to run the DB Batch backout utility?
what is the maximumm length of account information in job card of a jcl?
what is the use of ENTRY in IMS?
What are the main control blocks available in ims db?
How does one reorg an HDAM IMS database when changing RAPS (Root Anchor Points)?
Explain the advantage of creating the acbs well ahead of time?
What is psbgen process?
What is the difference between SIBLINGS and TWINS in IMS-DB database
What will happens when a BMP programs takes a checkpoints?
What is the maximum number of levels allowed in ims db?