What determines the relative effectiveness of fiscal and monetary policy in the IS-LM model of a close economy?

I have lost all my notes for an exam I have on monday and my lecturer does not put any notes on the internet so all I am able to go on is a few scraps of notes and the learning objectives of the course (which this and my previous question is one of). Also If anyone knows of a good online free (poor student :() notes resource for degree level macroeconomics that would be great!