Hello Rahul,

If you are under UG course than you can go in AIR FORCE through two ways first through AFCAT and another through CDS.

To know about the AFCAT books follow this link:https://www.amazon.in/AFCAT-Flying-Technical-Ground-Branch/dp/9312144553

To know about the CDS books follow this link:https://www.amazon.in/s/?ie=UTF8&keywords=cds+book&tag=googinhydr1-21&index=stripbooks&hvadid=183145386396&hvpos=1t1&hvnetw=g&hvrand=569433676380363736&hvpone=&hvptwo=&hvqmt=e&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9061725&hvtargid=kwd-146371062&ref=pd_sl_wc65zr2qg_e

If any queries remain than comment below.

GOOD LUCK...