Can I still enter the country after my visa is cancelled by a British educational institution? Can the school cancel the visa without knowing the visa information?

1) The school can cancel the visa. They can directly give the cas number to the Immigration Department.

2) You have communication problems with the school. If you are sick, you should tell the school honestly and get the certificate from nhs or hospital before returning home. It's a pity that you didn't do it. I suggest you keep in touch with the school now and show them your domestic certificate.

I think what you mean is that you don't want to study any more. If the school informs the Immigration Bureau to cancel your visa, you can't go back to the UK. If you want to come back, apply for a tourist visa and come back.

4) In any case, be sure to communicate with the school, or you may not get a visa in the future! ! ! In addition, all the evidence of this disease should be kept!