Hi Arjun,

The topic wise syllabus for Civil branch in GATE examination is as follows:

• General Aptitude (Mandatory)
• Engineering Mathematics (Mandatory)
• Structural Engineering
• Environmental Engineering
• Transportation Engineering
• Geo-technical Engineering
• Water Resources Engineering
• Geomatics Engineering

To get the syllabus in details and the referred books you can visit the following link:

https://engineering.careers360.com/articles/gate-syllabus-for-civil-engineering

Hope it helps.

All the best!