Hello, hope you are doing well, students from class 5th to 12th are eligible for nst for all the states except for the state of Haryana. The syllabus primarily depends on which class you are like for class 12th the subjects are maths, English, science, general Knowledge. The topics will be the same as you have already studied. There is no test fees mentioned on the official website so you can directly apply online. Yes, nst is safe and you can use this opportunity for your well being.

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Wish you good luck!:)