Second semester entry and summer school attendance: what do I need to know?

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The University of Sydney say that I can begin my Bachelor of Commerce next semester.

I'd like to do it in 2.5 years. To catch up, I'm thinking of doing 30 credit points next semester (instead of 24) and then doing 12/18 during summer school.

As mentioned here http://sydney.edu.au/handbooks/business_school/b_commerce/b_commerce_progression.shtml the first year required units are BUSS1000, BUSS1020 and BUSS1030. I have to do 48 credit points before beginning BUSS2000 next year which is the other compulsory unit.

• Is doing 30 credit points in a semester a good idea?
• Is 18 credit points possible in summer school (workload-wise) or should I do 12 and then do the rest next year? Can I do a total of 34-42 credit points (including compulsory stuff) this year and catch up next year, doing BUSS2000 in semester 2?
• Summer school will cost the same as regular attendance right? I can't find anything on their website but I've been told by a student that it does in fact cost the same.

Thanks!