Thanks you so much for your response SIR/Mam, one last question can I call immigrations after 3 months and clarify my mistake because it says on the website that you can report a change, I’m not sure if they allow us to fix date errors?? Thanks again.
Yes, once your application shows up in eCas and there is a file number, you can contact IRCC (telephone, email, webform, or by physical letter) and inform IRCC of errors in your application, provide corrected information, and explain how or why the errors were made. Be very, very brief in the explanation, to the point of saying little more than "I misunderstood what I needed to enter . . . . " or "I mistakenly entered [xyz] . . . " Avoid elaborating. Avoid explanations going into details about what you were thinking.
Correcting the application could be (perhaps should be) little more than a statement along the lines "I made mistakes entering the information in section xzx. The correct information is . . . " and, as simply and directly as possible, provide the corrected information . . . perhaps simply copy that section of the application and fill it out accurately and submit that. Stay simple. Stay direct. Stay focused on facts.
That said, odds are very high that by the time your application has a file number, by the time you can see your application in eCas, a decision will have already been made: either approving your application and initiating the procedure to issue and deliver your new PR card, or to refer your application for further processing, such as a referral to Secondary Review. Which is to say there is NOT much you can do, if anything, to avoid a referral to SR if the mistakes you made are such that will trigger a referral.
There have been other suggestions, like withdrawing the application. This is NOT likely to help much if at all. The application you submitted is not going away. It will not be erased from the system. Indeed, if on its face it raises significant questions, concerns, or suspicions, the odds are likely IRCC would continue to assess your case and, if circumstances indicate cause, investigate further, and IRCC would most likely continue to do that even if you attempted to withdraw. It may proceed with a PRC application notwithstanding the PR's request to withdraw it.
To be clear, there is nothing you have reported so far which suggests any such problems. The point is that withdrawing an application will NOT stop IRCC from reviewing the one submitted; withdrawing will NOT stop IRCC from pursuing any problems raised by the application.
Moreover, if a PR makes mistakes in an application for a new card which might appear to be deliberate misrepresentation, it would be far better, usually, to acknowledge and correct the errors at the first opportunity to do so. Withdrawing the application might be perceived as evasive and potentially make matters worse.
I cannot offer advice about what you should do. As I have previously noted, just what mistakes you made are not clear to me. Not all mistakes are created equal. Or treated equally. More serious mistakes call for affirmative correction sooner rather than later. Your error does not appear to be that serious BUT again it is not clear to me just what mistakes you made.
However, there is not much you can do until there is a file number for the application already submitted. Hopefully by then there is already a positive decision. (Contrary to what it seems many think, in routine cases the time between opening the PRC application file and a decision is ordinarily all in one sitting; whether it takes a half hour or two hours, most are done in short order.)