Those who don't take the math test for the first time can't take the math test online. You can look at the first two bits of professional code, which is a big category. At least the categories are the same, so it is possible to adjust.

The answer to your eighth question about the second interview is:

In principle, you can go to N schools for a second interview in time. After the adjustment system is opened, you can fill in two volunteers at a time or fill in separately. After 48 hours, the previous form can be automatically unlocked and modified, and the two volunteers are timed separately. If you have received the re-examination notice in this short time, you can modify the school and continue to get the re-examination notice. You were told that the school was invisible. In this way, you can receive eight re-examination notices, and of course you can go to eight schools for re-examination.