When I went for my Access to HE entry assessment, it consisted of a horseshoe group of tables, a simple enough exercise and some paper. I remember the English part, which seemed to consist of the teacher taking a very quick look at my page and a half and saying yes. I do not believe he read one word. The maths part was so easy, I do not remember it at all!
The purpose of the test is to confirm that you can read and write, not that you dabble in rocket science. You post shows that you are probably at the required standard, however they quickly identify those who may need help, so as to offer further help and training.
I really would not worry about it.
Good Luck!