Look back on your past reports (or ask yr instructor) - be honest with yourself - what is the main thing are you doing/thinking wrong and how can you (and he/she) correct it?
However some simple advice - do the simple things well, think as far ahead of the aircraft as possible and be flexible.
However, Biggus is absolutely right - most of all, don't EVER,EVER give up and BE POSITIVE.
Good Luck
flipster