brother we should not revise from notes, because if we will revise from 10 percent material then only half we will remember but if we will revise from 100 per cent , from book then at least main points will be remembered. notes should be the points or headings or the hints by which we can remind the topic as we cant copy and paste notes in paper as in paper we have to arrange the points according to the question and then we have to write on these points.
yeah you are right revising book is the best way and points from different books should be noted down as i had said that already in my sharing..

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