Secondly, if you don't have any special requirements, but think it's your own equipment problem, you can use third-party software to repair the network:
Suggestion:
① Please use third-party software to repair, such as: 360 security guards → system repair → hot issues → abnormal Internet access.
②360 Security Guard → Functional Encyclopedia → Network Optimization → Repair Network (LSP)→ Repair immediately.
As for the last tip, it is to warn the school to install the software ☆ over the wall ☆ privately, which can also be turned off.