Do foreign immigrants need to look at the portfolio from primary school?

Look at your immigration methods, technology transfer and investment transfer. ...

Specifically, see the materials required by the other country for your application for immigration.

Generally speaking, you can't see the portfolio, but for your academic qualifications, the Immigration Bureau may call the relevant schools to verify the situation during the background check, so you may still get some information. However, they generally don't pay attention to primary schools.