Hello,

Here are some of the books which will hep you for the prep of GATE CE(Civil Engineering):

Engineering Mathematics

• Discrete Mathematics and Its Applications by Kenneth Rosen
• Higher Engineering mathematics by B.S. Grewal
• Advanced Engineering Mathematics by Erwin Kreyszig

Structural Engineering

• Theory of Structure by CK Wang, S. Rammamrutham, L.S. Negi & Jangit
• Theory of Elasticity by Timoshenko & Gere
• Theory of Structure by Wilbur & Norris
• Strength of Materials/Mechanics of Structure by Gare & Timoshenko,E. Popove, L. Singer,B.C. Punamia, Rammamrutham

Geotechnical Engineering

• Soil Mechanics by Gopal Ranjan & Rao,Venkat Ramaiha,S. K. Garg,B.C. Punamia, V N S Murthy

Water Resources Engineering

• Water Resources by S K Garg
• Water and Waste Water by SK Garg 1 and 2
• Fluid Mechanics- RK Bansal and Fox and Richard

Transportation Engineering

• Transportation by Justo Khanna

Environmental engineering

• Environmental Engineering by S. K. Garg Part I & Part II
• Waste Water Engineering by B. C. Punamia Part I & Part II

Geomatics Engineering

• Surveying (vol. 1,2,3)  by B.C.Punia, Ashok Jain, Arun Jain

For more details, I would suggest you to visit the career360's link given below which has a deatailed explanation of all tha info related to GATE CE.

The link fror the same is:https://engineering.careers360.com/articles/what-are-best-books-for-gate-civil-engineering

Hope this helps and all the very best to you!