Today I passed my test.
So answer to the above question is that the tests on the website are nearly the same level as the real test. If anything the real test is a bit easier/less confusing.
On the whole, I feel if you are getting about 80-85% correct answers in the practice tests on this website then you should feel comfortable in the real one also.
In the end, it may be a bit of luck as well as I know some of my friends have failed with 51 marks. And some manage to pass with 52.
But good luck.
Happy to answer questions, but please don’t ask about which exact questions came in the test.