I want to get IBM C4040-129 certification. Please help where to find reliable resources for studying. Any help appreciated.
I assume you are pursuing certification as an IBM Certified System Administrator: IBM i 7.1 (test C4040-129: IBM i 7.1 Administration is also one of the tests required for another related certification). A good reference to the various IBM i resources (including Redbooks) has been pulled together in this IBM Systems Magazine blog post. There are also some courses offered through IBM training partners that will help you prepare for certification: