1. The network effect is not good. When the network effect is not good, not only the online training and examination system can't be opened, but also other online training systems can't be opened. You can check whether the network speed is in a normal state. If the displayed network effect is not good, you can try to change to another network.
2. The network is crowded. Due to the large number of students logging in, the network is crowded. There is no way to log in at this time. The only way is to wait until the free time before trying to log in. It is suggested that you try to choose the peak point of past login and try again.
3. Browser problem, some websites are designed with reference to a certain type or a certain browser, so the wrong browser will also lead to failure to open. At this time, the correct way is to try another browser.