My brother missed the date to renew his student permit by one day. What are the next steps that should be taken and how can he convince CIC that it wasnt done deliberatley but due to confusion of dates?Its urgent. Thanks

I suppose you are referring to the expiry date of student permit and that he missed it by one day of expiry of student permit. If that's the case then is still eligible to apply for restoration of student permit. But, he would need Letter of Acceptance from college to make his application.

In such cases after expiry date of your visa, you can apply for the restoration of status, but you must do it in within 90 days of your Study Permit expiry date. One more important thing is that you should provide full details or the circumstances of applying late.