Wrong date in residence calc sheet

Well there is probably no point in doing anything now before the test.

These alone do not sound significant, so if everything else is well in order, I see no reason to be much concerned let alone alarmed. Be prepared to verbally note, to the interviewing officer, "I made a couple small mistakes" and point them out, but without much emphasis, more or less matter-of-factly.

It is my impression that you may be counting time before actually landing as a PR. I am not much familiar with how such time is actually assessed (that is beyond the technical, one-half day credit for each day residing and present in Canada), but of course this is part of the overall picture of your case, and it is the overall picture that plays a very large role in how an application is assessed.

Minor errors or discrepancies in the residency disclosure are probably of little or no effect, particularly if they do not affect meeting the 1095 day threshold, particularly if the error results in more days present in Canada not less. But errors in conjunction with other factors may give rise to questions. A real lot depends on the totality of the application, all the facts, all the factors, all one's history, including of course work and address history.

You might want to bring additional documents with you to the test. I am not sure about how much this could help, but perhaps a few documents showing, foremost, actual activities in Canada (doctor and dentist visits say) and strong ties (property ownership or rental, utility payments), along with your health card, drivers' license, perhaps pay stubs from employment. But you really should not need all this, just might be nice to have in case there are questions raised.

Good luck with the test!