Really disappointed with Cambridge

Today I have received an email, which tells me that I will be adding an additional condition to my offer, which is the condition to the language test.

That condtion appears suddenly to my offer.
I sent an language waive letter to Cambridge when I was applying to it.
In my previous conditional offer, there wasn't the language test condition.
However, Cambridge said I must complete this condition, by the reason of the new policy.

If I saw this conditon in my offer when I received it, I would withdraw it and choose Oxford.
How could they do like that? Adding an condition when it is close to the deadline.

You need to go back to them and query why your language waiver letter is now being rejected, when it had previously been accepted. It may just be an admin error, but you won't know unless you ask them directly.

They said, it's their fault, but I must complete the test, due to the new policy.
I called the graduation admission, they express their useless apologize, and said I must do it as a result.

They said, it's their fault, but I must complete the test, due to the new policy.
I called the graduation admission, they express their useless apologize, and said I must do it as a result.

If I saw this conditon in my offer when I received it, I would withdraw it and choose Oxford.

You cannot be offered a place at both Oxford and Cambridge as you are not able to apply to both (at least at undergrad level). Of course you could have applied to one over the other. However, if we are honest if you are going to be studying a course at a British university in England, and English speaking country you should have no problem speaking english or writing etc at all - particularly considering the competition for places at Cambridge.

This is the postgrad forum.

Then my last point still holds. Courses are held in english not foreign languages

But your first doesn't, which is the point I made.

Today I have received an email, which tells me that I will be adding an additional condition to my offer, which is the condition to the language test.

That condtion appears suddenly to my offer.
I sent an language waive letter to Cambridge when I was applying to it.
In my previous conditional offer, there wasn't the language test condition.
However, Cambridge said I must complete this condition, by the reason of the new policy.

If I saw this conditon in my offer when I received it, I would withdraw it and choose Oxford.
How could they do like that? Adding an condition when it is close to the deadline.

I called the graduation admission, they express their useless apologize, and said I must do it as a result.

So the policy is for all students in your situation and its not specifically just because they have concerns about you?

Does the langauge test present a difficult barrier for you?

This is the postgrad forum.

Then my last point still holds. Courses are held in english not foreign languages

Seems like you can try arguing the case with Cambridge over the legality of changing an offer once made, or you can get on and do the test. Life lesson - people move goalposts. From your written English it doesn't seem like you'll have any problems passing the test.

Are you applying for an undergraduate or postgraduate course?

As an example for a Chinese graduate applicant Cambridge says "Based solely on your nationality, a language requirement will be set; please see below. However, you may be eligble for a waiver or assesment depending on your most recent degree." It doesn't look like Cambridge has recently changed any policies. Good luck!