Well done G-F0RC3, I also got the good news today. shocked and ecstatic in equal measure.
For those who unfortunately didnt get through:
This time last year I was in exactly the same position as you. I had got to Waterside, thought I put in a good performance but got the disappointing news that i wasn't successful. Firstly just reflect how well you did to get the final stage.
Secondly and this is what I did this time last year....Note down the entire application process from start to finish. What you were questioned on your interviews, what type of compass and aptitude tests you did (things that you remember from the tests and how you can maximize your score)
Think about the maths tests and write examples of the questions. Spend the next 6 months finding some great competency based answers and practice.
I found that I was much more prepared this time around and thankfully it worked for me.
Remember that the experience of going to Waterside will put you in a better position for next year.
Good luck all and don't give up.