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CSIR NET has five papers such as chemical science, physical science, mathematical science, biological science, and earth science,  it is conducted twice a year for a duration of three hours, there are mainly three sections - Part A  is common for all subjects, Part B contains subject-related conventional questions and Part C comprises higher value questions to test the knowledge of candidates, you can go through previous year papers at https://competition.careers360.com/articles/csir-ugc-net-question-papers , this will make you acquaint with exam pattern, marking scheme, important topics, weightage, through regular practice you will be able to analyze your level of preparation as well.