Hello,

In order to start preparation regarding any exam, candidates are required to be acquainted with the syllabus, you can check out NIOS syllabus at  https://school.careers360.com/articles/nios-12th-syllabus

Making a time table is vital part of exam preparation, time management skill is very important as you have to assign number of hours to each subjects and accordingly cover the entire syllabus within the stipulated time frame.

Going through the study materials of the course help a candidate a lot in qualify the exam with good score,NIOS also offers books in digital format, so if you don't have hard copies, check out at https://school.careers360.com/articles/nios-books-for-class-12

You can go through previous year papers at https://www.nios.ac.in/student-information-section/question-paper-of-previous-year-examinatto get  acquainted with paper pattern, important topics, marking scheme and other such relevant details pertaining to preparation of the exam.