The consequences of repeating a grade in junior high school in Hong Kong secondary schools

No impact.

It’s just that I will be a year late in joining the society. Some people may say that it would be easier to find a job if one year earlier. What I want to say is that whether or not a job is easy to find depends on the individual. It’s never about whether it’s earlier or later. When a person is successful, no one will care about how poorly he studied or how many years he studied. So if you repeat a grade, look forward, work harder, and strive to be better than before, then you will succeed.