SAM shouldn't be used for school assessment marks. The calculations within the system are meant to be for your external HSC Marks that you get before the release of your UAI.
This is no indication that your going to get 30 as ur UAI
Just keep working hard.
Your school assessment marks now are unscaled, uncalculated and not made according to what your school will send in, so it is still sooooo early to try and calculate your UAI on what you got now. At half yearly stage there are still at least one or two assessments left for each of your subjects, don't forget your trials which are a major component of them.
Just what im trying to say is DON'T WORRY! It means nothing now and is not an accurate representation of what you'll get! Keep trying hard and you'll achieve the very best! *thumbs up*