You have been able to have 2 units of Catogary B. The new rules for 3006 are:
As from the 2006 HSC, to be eligible for a UAI a student must satisfactorily complete at least 10 units of UAI courses. These UAI courses must include at least:
1. eight units from Category A courses
2. two units of English
3. three Board Developed courses of two units or greater
4. four subjects.
No IT VET is category B
So it sounds like it still will be OK