NDTV has exclusively accessed a handwritten NEET "guest paper" PDF that is now central to the CBI's investigation into the alleged exam paper leak. The leak trail reportedly began when a student in Kerala received the PDF from a friend in Sikar and forwarded it to his father, a hostel owner. A chemistry teacher later matched 45 chemistry questions and nearly 90 biology questions from the PDF with the actual NEET paper, taking the total match count to 135 questions. Investigators say the document became crucial evidence that exposed the alleged leak network.