Paper 3 has been removed from NET from 2018 (Notification)- now paper 2 and 3 syllabus is included in paper 2. Practice both paper 2 and 3 from past papers.

NTA UGC NET Defence Studies Paper 3 December 2014: Free and Fast Download of PDF

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Numerous fully-solved NTA-NET Defence Studies Paper-II questions (including prior year problems): Master concepts with detailed illustrated solutions.