Can't talk specifically for Southeastern, but I know SWT have an online assessment similar to the one you have just passed. This is usually followed by an assessment day where you'll sit one or two other assessments and an interview. You'll also likely fill out some vetting forms at this stage as this process can take up to 8-weeks and is the same level of vetting Police Constables have to attain (if successful you'll likely not have to await vetting clearance to start, but failure would most likely mean termination of employment before it's really begun). Hope this helps!