I would like to photoread 30 books in each subject. So quite many of them are relevant but not directly relevant to my syllabus. In that case, how should I state my purpose?

Usually, I would say,' My inner mind is now going to study the main ideas of the definitions, theorems, proofs and ways of applications'

I think I can't study all the def, thm, proofs. How should I state a general or suitable purpose so that I can photoread all the books at a time rather than doing previews and stating different purpose for 30 times?