On your demand I will suggest you some tips to prepare for Engineering Services Exam, so that you can get idea.

Tips for exam

General English
Refer to basic English grammar books and have a clear concept about the usage of words, parts of speech and tenses

Try learning few new words on a daily basis. This will help increase your vocabulary

When you are learning new words, learn their antonyms and synonyms too and the manner in which the words can be used

GK
To prepare for this section, be aware of what is happening in the country and across the world

Read newspapers and watch the news on TV regularly so that you are updated on what is happening around you

Refer to as many latest GK books as possible

Preparing for either one of the subjects - Civil Engineering / Mechanical Engineering / Electrical Engineering / Electronics & Telecommunication Engineering
For each subject, a detailed syllabus is chalked out. You can refer to the syllabus of the subject of your choice, get well acquainted with the same, and begin your preparation accordingly

The preparation should be such that not a single topic is left out

Make a routine and stick to it. The routine must allow you to complete the syllabus thoroughly and even revise it

Refer to past question papers as it will give you an idea of what to expect and also familiarize you with the pattern of occurrence of the questions