Follow the below tips to be able to solve quantitative aptitude questions (to be successful in various competitive exams like CAT, MH-CET, XAT, GMAT, etc.):
-Most important thing is to believe that there is a solution to every problem: quantitative or logical reasoning or IQ based. Use simple logic and treat each question on it's merit.
-Start doing yoga and meditation as they help to increase your concentration prowess and also help gaining control over your mind and thereby sharpen your thinking.
-Start referring R.S.Agarwal book for Quantitative Aptitude and Problem solving. This book contains all the shortcuts to solve majority of the questions that are asked in various competitive exams and also in several aptitude tests conducted by some companies to recruit college freshers.
-Make sure all your basics of Mathematics (like numbers, tables, algebraic equations, etc.) are strong.
-Write down all formulae and shortcut tricks (as described in R.S.Agarwal book) in your own notebook and refer to it regularly.
-Try to solve some puzzles for fun from puzzle books by Shakuntala Devi and also start taking interest in solving Sudoku puzzles.
-Refer the various aptitude questions posted on IndiaStudyChannel.
Thanks & Best Regards,