To dream of textbooks represents all known knowledge or experience about a subject or issue. Everything you already know about an issue or problem that can be applied to a current life situation. Learned methods, ideas, or approaches to dealing with problems.
It may also symbolizes access to good advice, past experience that can be applied, or all the answers or resources available to solve a problem.
Alternatively, a textbook may symbolize insight or something that motivates you to solve a problem or improve yourself.
To dream of returning or no longer needing a textbook symbolizes information and experience that no longer applies, or has no value to your current life situation.
To dream of a math textbook symbolizes all known knowledge or experience about an unforgiving subject or issue. Everything you already know about an issue or problem that requires total dedication or perfect behavior to solve. A math textbook may also symbolize insight or something that motivates you to solve your problems or improve yourself