The IRCC website does not provide detailed instructions. However, based on the Immigration Law IRPR 186, if the following requirements are met, you can work full-time until the results of the graduation work permit are out. If you are still unsure of whether it will affect future immigration and other factors, it is recommended to prepare your resume, interview and IELTS results while waiting for the graduation work permit, and then start your formal work after you get the graduation work permit.