Ayush, it has to be NSO. NEET is the entrance examination for admission to Medical, Dental, Ayush and Veterinary Courses across India. Now NSO is a competitive exam conducted for cultivating scientific reasoning and logical ability. This needs an indepth knowledge of science. But once someone prepares for NSO, appearing for NEET becomes easier because the preparation is extensive. You get a deep understanding of the basics and so at later stages, preparing for NEET becomes easier.