Other Books and Course Related materials is stuff that is not required to complete a course of study. For an example, if you buy Cliff notes for reference, these generally are not required by an instructor but is helpful for reference. This is true for all reference-related material. If it is not required, it is not deductible. If it is recommended but not required, it is not deductible.
Hopefully, this clears up some of the confusion involved.
[Edited 05-05-2021|01:17 PM PST]
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