First thing is you must know the subject for that you need study materials.
What are the good Study Materials?
I strongly suggests
1. MCQ by LAL and KUMAR (link)
(Why this book? Because Questions in the books are arranged systematically. i.e, Every Question related with before and after question. So you can understand not only the fact also the subject.) This book not updated according to new syllabus. But still its have value for subject understanding..
[Read any authors MCQ book but you need to read thoroughly] [If you know all the questions in any one of MCQ book, it will give you the confidence to score minimum Marks]
2. IGNOU Materials/any other university materials.
For exam purpose only I am suggesting MCQ books but for Interviews and to gain depth knowledge in our subject you need to read University Study Materials and Subject Books.
3.Old Question Papers
Old Questions Paper always helps to understand the question pattern and Important Questions etc.
(50-60% of questions will come from these three mentioned materials in UGC NET but 80-90% Questions will be asked in SET exams.)
How to start Reading for ANY Exam
Plan makes perfect.
So Prepare a schedule.
Strictly follow the schedule.
You can go beyond the schedule, but do not miss the schedule.
What you have to do?
** You must Thoroughly read Lal and Kumar MCQ or any other author,
IGNOU Materials/any other university materials.
READ, REVISE, REVISE Twice, REVISE Thrice...
TEST Yourself and PRACTICE at LISQUIZ.COM
[I am always mention this, Without reading any book and attending Quizzes in Lisquiz.com will help only little and it will take more time. But if you read already Books, Lisquiz.com will be your Knowledge checker and you will know where you are standing, how much you need to read more etc.]
Keep Reading, All the very best.