I think you have to wait their respond. Look at the last sentenceIn the citizenship test invite email I see they have written: "You can complete the online citizenship test even if you are not currently in Canada. However, you must inform IRCC that you are abroad before taking the test. You will also need to notify IRCC upon your return to Canada" I have mailed them back letting them know that I am outside canada and would like to still take the test - my question is do I have wait for them to get back to me or since I have informed them I can go ahead and take the test now? Thank you all
If you are outside of Canada and you would like to take the Canadian citizenship knowledge test from outside of Canada, please contact this office immediately by email within 24 to 48 hours from the date of this notice and indicate “Outside Canada” in the subject line of the email and provide your name, application number and the start and end date for your online test. We will contact you with the next steps after we receive your email.