Hello,

NIOS exam is going to held in April that means you have 2 month left now which is very less to complete whole syllabus.first of all you need syllabus to prepare without this you are end up with reading irrelevant material.here is syllabus of NIOS you can find it in link.

https://www.google.com/amp/s/school.careers360.com/boards/nios/nios-12th-syllabus/amp

As NIOS difficulty level is moderate you can study through guide and sample papers to secure passing marks.if you write in exam point to point you may fetch good marks.increase your self study time do hard work to achieve your goal.

Good luck!!