Please tell me the best books for the preparation of gate exam for electrical engineering.

Here are some of the books name you can prefer for GATE EE given below:

Engineering Mathematics- by E.Kreyszig

Networks- by Hayt and Kemmerly

Signal and systems- by Oppenheim and Wilsky

Electrical Machine- by P.S.Bimbhra

Power system- by Nagrath and Kothari

Power Electronics- Electronics by MH Rashid

Control system- by Nagrath and Gopal

Measurement- by AK Sawhney

Analog- by Boylestad

Digital Circuits- by M.Morris Mano

Electro Magnetics- Mathew N. O. SADIKU

For Problem Solving- by RK Kanodia

Circuit analysis- by Arieh L Shenkmann  and also Chakrabarthi

For further detail about you can go thorugh with given below link.

GATE EE Books