Dear Sanchita,
If you are asking about NIOS exams then you can go through the link below to check the detailed syllabus and sample question papers of the subjects. Questions will be asked from the mentioned syllabus and the textbooks only. You can check the sample papers to have an idea about the type of questions asked.

https://nios.ac.in/student-information-section/syllabus-sample-question-paper(sr-secondary).aspx

You can ask if you want to know abouit any other exam?
Good Luck!

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