Dear Aspirant,

Here are the books you should refer to for preparing GATE aerospace engineering:-

Fluid Mechanics R. K. Rajput

. Thermodynamics Michael Boles; Yunus Cengel

Aerodynamics, Flight Mechanics John. D.Anderson

Strength of Materials R.K. Bansal

Flight Stability and Dynamics Thomas Yechout

Engineering Mechanics Bhavikatti

For practice paper and mocks you can use ARIHANT PUBLICATIONS BOOKS.

Hope this helps. Thank you.