i also have no background of psychology at all.but i took it.though it is quite lengthy but it can give you huge score if prepared well.
but do not reply only on one book.must include other authors as well and broaden your knowledge as it is a competitive exam and people are coming with maximum knowledge must broad your preparations and must make your own notes on the topics.
divide your course into topics and start preparing topic wise.
analyse past papers and see the questioning trends as there are many topics that seems harmless and examiner asks questions with full detail
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