The CSIR NET Chemical Sciences exam is conducted for candidates aspiring to work as lecturers or researchers, with eligibility requiring a degree in chemical science and specific age limits for JRF. The exam consists of three parts with a total of 200 marks, and it is essential to prioritize studying key topics in organic, inorganic, and physical chemistry due to the lengthy syllabus. Candidates are advised to use quality study materials and practice previous years' question papers to prepare effectively for the exam.