Go through the previous year paper’s logical reasoning and mental ability portion to get an idea about the nature of the questions asked.
According to me, these are the best books to tackle the questions. I have used them thoroughly and was able to get most of questions correct, if not all.
Best book for Reasoning – Test of Reasoning for All Competitive Examinations by Edgar Thorpe
Best book for Mental Ability – Course in Mental Ability and Quantitative Aptitude by Edgar Thorpe
This portion of the paper is relatively easy, and you can even score full marks here! These questions take less then one minute to solve. Usually consisting of a paragraph, these are fun to solve, and give you more time to answer the mathematics portion well.