Hello Vishal
BGP is capable of achieving unequal cost load balancing for both iBGP and eBGP. In order to do this, you must first configure the maximum-path value to be 2 or greater, as shown in the lesson. Now, if you have two paths with equal weight, local pref, AS_PATH length, Origin, and MED, then you will achieve equal cost load balancing.
To achieve unequal cost load balancing, you must use the additional feature called dmzlink-bw. This feature will enable and configure BGP to distribute traffic proportionally to the bandwidths of the links.
More information about this command, the syntax, and how it is to be used can be found at the following Cisco documentation.
I hope this has been helpful!
Laz