study guide Ruby Association Certified Ruby Programmer Silver

[Fazile Moser]

Hi

Which study guide for Ruby Association Certified Ruby Programmer Silver?

Ruby Association Certified Ruby Programmer Silver:
This is a basic skill-level certification of the knowledge on the background, grammar, classes, objects, and standard libraries of Ruby. The logo on the right side identifies people who are certified.

http://www.ruby-assn.org/certification/programmer/

Execution environment
> Execution method
> Commandline option
> Environment variables
> irb

Grammar
> Comment
> Literal
> Variables, constants, and scope
> Operators
> Conditional branch
> Loops
> Exception handle
> Call method
> Block
> Method definition
> Class definition
> Module definition

Built-in Libraries
> Built-in functions
> Built-in classes

Object orientation
> Polymorphism
> Inheritance
> mix-in

[Stefan Feldmann]

It seems Ruby Association Certified Ruby Programmer Silver is an entry level certification (basics). Please guide me to good preparation books. I am a programming beginner.