Actually, there are as such no books needed to prepare for NPAT exam which is completely an aptitude test still you can refer the books mentioned in the below answer, all 3 of them are good. NPAT exam has 3 sections quantitative ability, Logical Reasoning and English Proficiency. To score in all the 3 sections you need to practice a lot. You need to attain speed with accuracy in the short time.

Level of questions are generally easy and you can learn the concept of each topic given in the syllabus through http://indiabix.com site. This site not only teaches you basics but also make you solve questions and go through tests in order to get clear with each and every concept properly.

Now the main thing to score in NPAT exam is to get a strategy, attain speed with accuracy so as to solve 150 questions in 120 minutes. You can do that by start giving lots of online mock test and analyse solutions of each one of them  thoroughly which will help you in overcoming your mistakes and come up with a strategy to definitely improve your marks and percentile. It will also help you to know about your strength and weakness which will help you in attempting easy questions first, that will reduce your chance of committing a silly mistake in an easy question or missing out an easy question. Along with this, you will also get enough time to attempt medium level difficult questions which will overall increase your speed with accuracy which leads to increase your percentile.

Testfunda, Oluveboard, hitbullseye, cracku.in, youth4work.com, bschool.careers360.com are some of the sites where you can get online mock test papers.

Feel free to ask if you have any more queries. All the best for your preparations and exams!!

Hello Hritik,

You can prepare yourself for NPAT by reading these books thoroughly-

• Chand Quantitative aptitude for Quantitative examinations by R.S.Aggarwal
• S.Chand Modern Approach to logical reasoning by R.S.Aggarwal
• Ramesh Logical and Analytical - R Gupta

You can even refer to GGSIPU BBA material for NPAT preparation.
like BBA Entrance exam by Gangal J.K
BBA entrance complete book by Chandresh Agarwal and BBA entrance guide by RPH Editorial Board.
Hope this helps.
Good Luck.