Quantitative aptitude is an important section and every other exam consist this section with different difficulty level questions. the accuracy and speed is the essential things which can help to score in this section. and to improve your speed, you need to use short trics to solve the problems.
First clear your basic concepts and solve related exercise.
Learn all the important formulas and find short tricks to solve the questions.
You can use vedic mathematics to solve calculation easily.
Learn Table, square and cubes to do the calculation faster.
Solve as much questions as you can. Practice, solving previous year papers and mock test will improve your quantitaive section.
There are short tricks to find SI & CI, for multiplications, addition. Also learn short method for percentage, mixture, age problem, profit & loss etc.
Go through the complete syllabus and check in which topic you need extra attention and in which you are confident.
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All the best.