Hello,

The best books for the GATE civil are as follows;

1. I. Strength of Material by R.K. Bansal

    II. Strength of Materials by U.C. Jindal

    III. Strength of Materials by B.C Punmia

2. Structural Analysis- Theory of structures by S. Ramamrutham & R. Narayan

3. R.C.C. Design- Reinforced Concrete Design by Devdas Menon & S. Pillai

4. Design of Steel Structure by S.K. Duggal

5. Environment Engineering – Water Supply Engineering: Environmental Engineering v. 1 & Sewage Disposal and Air Pollution Engineering by S. K. Garg

6. Soil Mechanics – Basics and Applied Soil mechanics by Gopal Ranjan, A.S.R.Rao

7. I. Hydraulics and Fluid Mechanics by Dr. P.N.Modi,    Dr.S.M Seth

     II. Fluids Mechanics in SI Units by Yunus Cengel

8. Highway Engineering by S.K.Khanna, C.E.G.Justo

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

10. Engineering Hydrology by K Subramanya

Hope this will help you. Best of luck.