studying hard for the first assessment and getting a credit =P as jago said, if you study your arse off you should be getting higher than a credit.
and it doesnt work that way. there is no internal transfer from a lower uai course to a higher uai course in mid-year transfers. that is based on uai alone for new school leavers.
however, you may attempt to transfer after the first year. i.e. 50% first year marks, 50% uai.