If you are trying to find the BGP best path selection algorithm on the DOC CD it has been removed from the 12.4 documentation for some crazy reason!
You will need to go back to the 12.2 documentation
The full path is
www.cisco.com / support / configure / producst / cisco ios and ns-ox software / cisco ios / Cisco IOS Software Release 12.2 Family /12.2 Mainline / configuration guides / Cisco IOS IP Configuration Guide, Release 12.2/ Part 2: IP routing protocols / Configuring BGP / then click on How BGP Selects Paths.
It will take you here: http://www.cisco.com/en/US/docs/ios/12_2/ip/configuration/guide/1cfbgp.html#wp1000898
Let’s examine each step in detail, you will need to master this document so print it off and read it multiple times
Good luck with your CCIE studies