A diploma part-time outside university is feasible right? Surely it's still less workload than my buddies doing an actuarial and commerce double degree at Monash?
Both your Bachelor of Commerce, and your friends' Commerce/Actuarial Science would typically have a standard workload of 4 units per semester. Despite it being a double degree, you'll be having the same workload (ignoring the fact that some units are harder, etc.). Doing a part-time diploma (1 unit/semester) will mean you are essentially completing 5 units a semester. Many students in first year struggle to cope with 4 units a semester, and choose to drop to 3.
If you're keen to do the diploma, then I would recommend holding off on it for at least a semester. This way, you'll be able to see what a standard workload looks like, and judge as to whether you'll be able to take on an extra unit
