Since you mentioned you are studying business, i assumed you should be accepted for HR, procurement or business excellence? Correct me if I'm wrong.
DSTA as its name imply, deals mainly with technology, engineering and defence related projects. Non-engineering grad going into
DSTA often find themselves losing out on salary/prospect. They are also on two different pay scheme.
I'm not sure what role in
DSTA you are being offered so i cannot comment much. But
DSTA has put in alot of effort in making sure their staff are paid competitively in the market. Salary adjustment will be made if your salary was found to be losing out competively.