What set are you in now? Why do you want to move up?
It isn't always better to be in the better set. Teachers generally are better at knowing which set you should be in. I got moved from set 1 to 2. At first, I hated that decision, but throughout the year, I started to realise it was the best decision they could have made. I was moved down due to confidence and I have to say it was a lot better to be best in the class than middle to bottom of a class. Ended up with a 9 in GCSE Maths, top of the class and better than most of set 1!