I will let you know the syllabus of Delhi Metro Rail Corporation, JR Engineer Electrical post so that you can prepare hard.

Here is the syllabus

English
Basics of English Language
Vocabulary & Grammar
Sentence structure
Synonyms & antonyms and its correct usage

General Awareness
Current Affairs (National and International)
Major Financial/Economic News
Budget and Five Year Plans
Who is who?
Sports
Books and Authors
Awards and Honors
Science – Inventions and Discoveries
Abbreviations & Important Days and many more

Quantitative Aptitude
Number System
HCF, LCM
Simplification
Decimal Fractions
Ratio and Proportions
Unitary Method
Percentage, Time and Distance
Time and Work
Profit and Loss
Average
Simple and Compound Interest
Menstruation (2D and 3D)
Algebra
Data Interpretation

Logical Ability
VERBAL:
Number & Alphabet Series
Test of Direction Sense
Coding-Decoding
Arithmetical Reasoning
Problem on Age Calculation
Blood Relations & Decision Making etc.

NON-VERBAL
Non Verbal Series
Mirror Images
Grouping Identical & Embedded Figures

Electrical Syllabus
Network Analysis.
Power Electronics & Drives.
Electronics Devices.
Electromagnetic Theory.
Analog and Digital Electronics.
Electrical Instrumentation.
Power System Analysis & Control.
Utilization of Electrical Energy.
Power System Protection.
Control Systems.
Power Systems.
Electrical Machines.
Switch Gear and Protection etc