You have to wait til around October when they will post up a list of subjects offered.
Note that, just because it was offered last summer, it doesn't mean it will be offered again in the coming summer. It depends on the no. of students willing to take the subs, and whether the lecturers are willing to teach the subs over the summer, etc
But as for the accounting subjects... I think the first year accounting, (Accounting for Business Combinations) is always offered, and also Accounting Transactions for Business Decisions. I'm not too sure if Cost Management Systems is always offered, but it was offered for last summer (since I did it)
Hope this helps =]