Need some assistance not sure if IRULE is best way handle this requirement - If it is need some help with IRULE please.

if that isn't sanitized data, I'd recommend sanitizing it.

assuming you drop all your internal IPs into a data-group called internal_ips, something like this should get you started (untested):

when HTTP_REQUEST {
  switch -glob [string tolower [HTTP::path]] {
    "/internal-rates*" -
    "/loan-and-credit-card-rates*" -
    "/deposit-and-share-rates*" {
      if { ![class match IP::client_addr equals internal_ips] } {
        HTTP::redirect "http://[HTTP::host]/"
      }
    }
  }
}

I would solve this by creating two data groups. One with the IP addresses - let's call that data group internal_IP for the example below. The other data group would contain the restricted URI:s - so let's call it restricted_URI. And just to avoid some headaches I would enter them into the data group as strictly lower case strings. Then I would create an iRule like this:

when HTTP_REQUEST {
   if { [class match [string tolower [HTTP::uri]] starts_with restricted_URI] }{
      if { ![class match [IP::client_addr] eq internal_IP] }{
         HTTP::respond 404
      }
   }
}

So if anyone requests the restricted URI:s, if the source address isn't one of the approved ones you get a 404 message back. Also note that HTTP::uri returns the part of the URL without the hostname, starting with the first slash, so don't include the hostname in the strings when creating the data group.