As you have asked about the materials to prepare for E Litmus pH test, I am providing you with its syllabus which will help you, check below for the details

E Litmus is a national level assessment for all those out there looking out for entry level engineering jobs.
E-litmus conducts pH test.

Syllabus of Elitmus Test:

There are 3 Sections of an eLitmus pH Test Paper and each section contains 20 Questions.

Quantitative Aptitude:
Problem Solving or Data Interpretation and Reasoning
Verbal Ability

There are 20 Questions in each section.

Syllabus for each section of the elitmus test paper :

1. Quantitative Aptitude Syllabus for elitmus pH Test

Number Systems
Averages
Percentage & Interest
Time, Speed & Distance
Geometry
Coordinate Geometry
Logarithms
Quadratic Equations
Probability
Permutation & Combination
Few Miscellaneous Questions

2. Syllabus for Problem Solving Section of Elitmus pH test :

Data Tabulation based Questions
cryptarithmetic Problem
Arrangement Based Problems
Bar Graphs/Pie Charts
Few Miscellaneous Questions

3. Verbal Ability Syllabus for elitmus pH Test

Questions Related To Grammatical Concepts
Paragraph Based Questions
Fill In The Blanks
Reading Comprehension