If there's a CIT0520 attached to the invite see what additional documents they need from you (look for checked boxes), if there's none then I guess make sure you have the originals of whatever you submitted for Cship plus ID (driver's license, PR, Health Card) and COPR.
Hi Lex. Thanks for taking the time to reply. No there was nothing attached to the e-mail apart from the invite and the consent form. I have everything ready, my IDs, passport, and COPR, also my certificates and letters from employers that I sent with the application. Actually I am a little worried, as I am reading that the interview is not always a smooth process. Sometimes the officer is super rude and gives the interviewee a hard time, undermining their travel nd work history etc. The interview is on April 1st and it is very soon after my test which I passed 20/20. I have not received the official test results though. This and the fact that they don't want any supporting documents from me makes me worry that they are going to reject me.