APS3 level is pretty low level, near enough training level. Rising to higher APS levels would be an expected result reasonably quickly. However, I have known some stay at 3 for some time. The super contribution they get bumps up the financial benefit more than normal jobs though.
Roles at this level may:
Investigate and manage routine cases via resolution of customer issues with assistance from higher classification levels.
Under substantial supervision, provide assessments and interventions.
Provide initial customer assessment for referral to more senior employees.