You can change the exam centre in the CSIR NET Correction window. You can follow the given steps to make corrections in their CSIR NET application form including the choice of city:
NTA has made clear that they do not make corrections of the change in examination city such based on individual emails, calls or any hard copies of letters. Therefore, the candidates are advised to avail the facility of correction window only through the official website of CSIR NET.
There will be less time for the preparation of the exam. The candidates are advised to follow some basic tips like Solving previous year papers, Giving mock tests, Revising all topics and Practicing regularly to crack the exam.