Elitmus Exam Numerical Ability Age Problem

My elitmus percentiles are given below:
Apti-93%
problem Solving:81%
English: 60%
which book should i refer for the preparation of problem solving???

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Elitmus Other Question

In a cart the ratio of the area of the front wheel to back wheel is 125:180.distance travelled by front wheel is six times that of back wheel.if circumference of back wheel is 36 ft,find distance travelled by the cart? tell the right one...
Surplus is related to Sufficient as …… is related to Need.?????
Op 1: Gathering
Op 2: Demand
Op 3: Excess
Op 4: Storage