I've done those tests a few weeks ago! I was also very anxious, in fact, I was panicking!
No need to, though. The literacy test is very easy, you just have to very attentive to the details. I remember there was an exercise (both tests were done in a computer) in which you had to identify the spelling mistakes. It said the customers could pay by "check". Lol. When the right thing to say was "to pay by cheque". Stuff like this. Very easy, you just have to focus.
The numeracy test was a little harder for me, I have been out of education for years as well, and my background is in social sciences... So there were some exercises that I honestly had no clue, but then there were others that were actually very simple. Stuff like interpreting excel graphs and saying how many 10 km are in miles and stuff like that. I was given a scientific calculator to use during the test. So, I didn't find it extremely easy, but I would say it's quite doable overall. And believe me, if I did manage to succeed in the numeracy test, then you surely will as well, because I was really rusty and couldn't even remember to use the calculator properly... I mean I could do the basic stuff only!
So, yeah, you just have to focus a lot and don't panick. I was told that if the results of the tests weren't good enough, I could come in a few weeks later and do it all again. So, they are definitely understanding.
The interview was very laid back. I was asked what I wanted to do in Uni and the teacher explained some things related to the course and college. No big deal, real. Then we (I was interviewed with another girl) were told we were in!
"Welcome on board!", she said.
Oh, she also advised us, prior to welcoming us on board, that the course would be very demanding and that we had to work hard and we couldn't afford to skip classes or get out earlier, just in a case of emergency or illness.
About the tuition fees, how old are u? Do you have 5 GSCE at grade C or above?
Hope this helps. If u need any help, feel free to ask.