Hello, The CSIR NET is offered in five subjects only of which deals with chemistry so all kind of chemistry major students will be choosing the chemical sciences subjects only.There will be both inorganic and physical chemistry as a part of syllabus even though you are aiming for organic chemistry alone. Here is the official syllabus of Chemical science subject https://d2cyt36b7wnvt9.cloudfront.net/exams/wp-content/uploads/2019/08/28185930/20181113114718481mcs_cs_sylbs.pdf

Best of luck.