Try these skills in Khan to prepare.
number line
Fractions on the number line
Unit fractions on the number line
Finding 1 on the number line
add and subtract fractions
adding fractions with unlike denominators
subtracting fractions with unlike denominators
adding and subtracting negative fractions
multiply fractions
visually understanding multiplying fractions by whole numbers
understanding multiplying fractions by fractions
multiplying fractions
Multiplying positive and negative fractions
Multiplying mixed numbers
divide fractions
dividing fractions