Fractions (like Percentages and Decimals) are always present in the Numerical Aptitude section of the Civil Service Exam so better be acquainted with the basics of it before you take the test.
What is a FRACTION? A fraction is simply a part of a whole number. It is also a number you get from dividing one whole number by another.
HOW TO PERFORM THE BASIC MATH OPERATIONS ON FRACTIONS
The Civil Service Exam includes what most people refer to as the “Finding the Best Sentence” questions. It is that part of the exam where you’ll be given five sentences and then you’ll have to choose which sentence is best with respect to grammar and usage suitable for business writing. To ace that part of the exam, you have to know the rules of grammar and you have to be familiar with the most common grammar mistakes which most aptitude exams utilize. Among these grammar mistakes are misplaced modifiers.