Can I retake the test later during this application period?
No, every applicant only gets one shot at the test. Once you start the test, you have only that chance to complete it. It is not possible to cancel the test and retry later. Similarly, it is not possible to take the test again on a later date to improve your result.
If you attempt to take the test more than once, this will be considered cheating and your application will be rejected.
Anyone who does not pass the Qualification Assessment Process can apply a second time for BSc AT in a later year and take the test again. More than these two attempts are not possible.