Quantitative aptitude has become a compulsory subject for the preparation of competitive exams in India. Though the quantity of problems and pattern could be completely different across different exams, but the character of the problems are basically same in nature. Problems are often expected from quantitative aptitude are different sections like ratio's, proportion, numbers, averages, profit and loss, time and work, percentage, surds, HCF and LCM of numbers, probability, partnership and etc.
To prepare for quantitative aptitude you can follow different books like Upkar's quantitative aptitude, Kiran's quantitative aptitude, R.S Agarwal etc. It is vital to collect all the formulas of different sections into one place. It will help you to take a quick look before the exams. And you should look down those formulas on a regular basis. As an example you must understand the formula to calculate the compound interest accrued on the same amount at the same rate in the same period of time on a given simple interest.
While practicing quantitative aptitude problem it's additionally essential to practice various puzzle type questions as much as possible. Because solving these puzzle types of questions will give you confidence that you are well prepared and you can solve any problems related with this specific section. The problems of quantitative aptitudes can be solved in various ways. But it must be kept on your mind that in competitive exams the time span is short, so you have to take the shortest process to solve any problem.
There are several books available in the market. The better option is to choose a book that will makes you comfortable for solving any problems. So, buying a high quality of rich content book is not the key of success. Your understanding ability will play a vital role for choosing your career book.
These are all about Quantitative Aptitude portion, and now take a look at the other important portions. Regarding reasoning section, any questions answers with solution book will help you a lot. Other parts like English language, is also important for competitive exams. Synonyms, Antonyms, Fill in the blank, Error correction these are the major parts of English section. Also you can study grammar portions especially tense, verbs, group verbs, idioms for better result. And the last but a very vital portion is general knowledge. The questions of General knowledge portion are related with arts, literature, science, technology, sport, history, geography and current affairs. You can follow different news channels for latest news and affairs.
Books are OK, but you can follow some online websites that gives you tutorials, questions answers, quiz test on these portions.