If you are trying to find the BGP best path 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

Good luck with your CCIE studies

Roger