Hiii

First of all there is no best book, there are different books for different universities.
The most common of them are R.Gupta, Arihant for University of Delhi and Arihant for Guru Govind Singh Indraprastha University.
Almost every book has the same content. So i would suggest you that you can go for any book of your choice, just make sure that which ever book you take, you study with confidence and focus. You must practice the questions of all the three sections i.e Reasoning, English and Teacher aptitute and attitude. so that you can master it and it becomes easy for you to solve the actual question paper.
Keep on practicing and stay focused and confident.
Do not loose hope.

All the best!!