Go on a long holiday between now and the end of term. It's the last term time holiday you'll have for a good many years...! Other than that, do lots of reading - anything relevant - lots of thinking through the curriculum, lots of mental planning. Gather lots of ideas/resources - so much on the internet. Think carefully not just about maths, but about pedagogy in general, and about the craft of the classroom in particular. What sort of teacher do you imagine you'll be? How are you going to deal with kids that don't want to learn. How are you going to further enthuse those that do? It's nearly 25 years since I started, so perhaps an RQT might be along offer their more up-to-date thoughts.