Actually the agent told me IRCC reviews the application because I rescheduled the citizenship test twice. I did not know why it is a problem in rescheduling the test.
You can reschedule your citizenship test thats not the problem but you need a reasonable explanation. If you reschedule once with a reasonable explanation it's fine but as in your case twice might be a problem that's why they are Reviewing to see if your explanation is reasonable as most people gives priority to completing test while there are few that have to reschedule once with a reasonable explanation.