I dropped 2 unit 1/2 way thrugh year 11, and am now topping General but i can tell u i regret doing it.
I mean if u are getting a decent result and can cope with all the work stick with it.
I'v now found that the couse at Uni i want 2 do, requires Mathematics (so check that out first) and i'm...
1) first add 8hrs to 3.pm
so u would arrive at 11pm perth time
Then the hard part figure the amount of time between perth and cape town, look at time zone diagram (http://www.time.gov/images/worldzones.gif) and u'll find perth is +8 and cape town is +2 so we need to - 6 hrs as were ahead...