Is it possible?

Hi everyone
I recieved an unconditional offer from uni then I accepted and I recieved confirmation email, username password and university email and also certificated of acceptance but today I recieved an email from admission that they said we are sorry but we revert your unconditional to conditional due to english test and this is our mistake!
is it possible? what should I do?

That's very bad of the uni to do that! Which course is it for? They should never have given you an unconditional offer before seeing your English test results! As you have accepted the unconditional offer and also the certificate of acceptance it could be that they are legally bound to honour it? Are you an international student and are you confident that your English is at a high enough standard to manage the degree you've been offered? I would call the admissions department and ask them if they can do this after you have accepted the offer?

I agree that it’s bad form of the uni, but if you’re an international student then this is a UKVI requirement. The offer status is basically irrelevant as you’d have to take an English test regardless.
Thankfully this was caught quickly so hopefully you’ve not taken any action based on the original offer.

Thank you for your response but I am online student ( home )