AND, OR, and ELSE in Rules

Well I guess I can write it like this:

if pp<8 then exit rules, skip Outgoing Action
if pp>12 then exit rules, skip Outgoing Action
else // do this

But I'm also interested to know if there's a general rule or suggested procedures to concatenate conditionals.
What I'm doing now is basically exclude everything that don't belong to what I want to affect. But I see in the log a ton of processing, I'd like to keep this "cleaner".